Quarterly Financial Data [Abstract] QUARTERLY FINANCIAL DATA (UNAUDITED) Quarterly Financial Information [Text Block] Accounting Policies [Abstract] Principles of Consolidation Consolidation, Policy [Policy Text Block] Reclassifications Reclassifications [Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Accounts Receivable Receivables, Policy [Policy Text Block] Financing Receivables and Allowance for Credit Losses on Financing Receivables Finance, Loans and Leases Receivable, Policy [Policy Text Block] Long-Term Receivables Long Term Receivables [Policy Text Block] Disclosure of long-term receivables. Inventories Inventory, Policy [Policy Text Block] Deferred Contract Costs Deferred Charges, Policy [Policy Text Block] Prepaid Expenses and Other Current Assets Prepaid Expenses And Other Current Assets (Policy Text Block) Prepaid Expenses And Other Current Assets Policy Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Other Long Term Assets Other Long Term Assets [Policy Text Block] Other Long-Term Assets Accrued Expenses and Other Accrued Expenses and Other [Policy Text Block] Accrued Expenses and Other, Policy Incentive Compensation Compensation Related Costs, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Shipping and Handling Costs Shipping and Handling Cost, Policy [Policy Text Block] Advertising Advertising Costs, Policy [Policy Text Block] Research and Development Research and Development Expense, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Stock Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Net Income (Loss) per Common Share Earnings Per Share, Policy [Policy Text Block] Concentration of Credit Risk and Other Risks and Uncertainties Concentration Risk, Credit Risk, Policy [Policy Text Block] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Entity that Current Director Owns Minority Interest and Serves as Board of Directors Chairman [Member] Entity that Current Director Owns Minority Interest and Serves as Board of Directors Chairman [Member] Entity that Current Director Owns Minority Interest and Serves as Board of Directors Chairman [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Related Party Transactions (Textual) [Abstract] Related Party Transactions (Textual) [Abstract] Related party transactions. Purchased goods and services Related Party Transaction, Purchases from Related Party Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] U.S. Markets U.S. Markets [Member] U.S. Markets [Member] Engineered Systems Engineered Systems [Member] Engineered Systems Member Distribution Services Distribution Services [Member] Distribution Services [Member] Corporate and Other Corporate and Other [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Corporate and Other Segment Reporting Information, Revenue for Reportable Segment [Abstract] Revenues Revenues Operating (Loss) Profit Operating Income (Loss) Depreciation and Amortization Depreciation, Depletion and Amortization Capital Expenditures Payments to Acquire Property, Plant, and Equipment and Productive Assets Payments to Acquire Property, Plant, and Equipment and Productive Assets Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Common stock options Employee Stock Option [Member] Restricted shares Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant [Roll Forward] Number of shares available for grant, beginning of period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Granted stock options (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Shares Issued to Employee Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Shares Issued to Employee Granted shares (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Shares Issued to Non-Employee Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Shares Issued to Non-Employee Restricted shares (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Restricted Shares Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Restricted Shares Forfeited stock options (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant, Forfeited Number of shares available for grant, end of period (shares) Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits, by Title of Individual and by Type of Deferred Compensation [Table] Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits, by Title of Individual and by Type of Deferred Compensation [Table] Deferred Bonus and Profit Sharing Plan, Type of Deferred Compensation [Axis] Deferred Bonus and Profit Sharing Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] Deferred Bonus and Profit Sharing Arrangement, Individual Contract, Type of Deferred Compensation [Domain] Deferred Bonus Deferred Bonus [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] Discretionary bonus payments, percentage Deferred Compensation Arrangement with Individual, Discretionary Bonus Payment Percentage Deferred Compensation Arrangement with Individual, Discretionary Bonus Payment Percentage Discretionary bonus payments, profit achievement before taxes Deferred Compensation Arrangement with Individual, Cash Award, Threshold, Profit Before Taxes Deferred Compensation Arrangement with Individual, Cash Award, Threshold, Profit Before Taxes Discretionary bonus payments, revenue achievement percent (minimum) Deferred Compensation Arrangement with Individual, Cash Award, Threshold, Revenue Growth Percent Deferred Compensation Arrangement with Individual, Cash Award, Threshold, Revenue Growth Percent Discretionary bonus payments, revenue achievement (minimum) Deferred Compensation Arrangement with Individual, Cash Award, Threshold, Revenue Deferred Compensation Arrangement with Individual, Cash Award, Threshold, Revenue Deferred financing costs Debt Issuance Costs, Noncurrent, Net Security deposits Security Deposit Deferred contract costs Deferred Costs, Noncurrent Other Other Assets, Miscellaneous, Noncurrent Other Assets, Noncurrent Other Assets, Noncurrent Debt Disclosure [Abstract] Fiscal 2017 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Fiscal 2018 Long-term Debt, Maturities, Repayments of Principal in Year Two Fiscal 2019 Long-term Debt, Maturities, Repayments of Principal in Year Three Fiscal 2020 Long-term Debt, Maturities, Repayments of Principal in Year Four Fiscal 2021 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Long-term debt Long-term Debt Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Harris Harris [Member] Harris [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Purchase agreement, value Business Combination, Consideration Transferred, Initial Purchase Agreement, Amount Business Combination, Consideration Transferred, Initial Purchase Agreement, Amount Purchase agreement, potential adjustment, amount Business Combination, Consideration Transferred, Initial Purchase Agreement, Contingent Adjustment, Amount Business Combination, Consideration Transferred, Initial Purchase Agreement, Contingent Adjustment, Amount Contingent consideration, recorded liability Business Combination, Contingent Consideration, Liability Acquisition consideration, cash Payments to Acquire Businesses, Gross Acquisition consideration, debt Business Combination, Consideration Transferred, Liabilities Incurred Acquisition consideration, debt term Business Combination, Potential Consideration Transferred, Liabilities Incurred, Debt Instrument, Term Business Combination, Potential Consideration Transferred, Liabilities Incurred, Debt Instrument, Term Acquisition consideration (shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Business acquisition, common stock issued Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Acquisition consideration, share price (usd per share) Business Acquisition, Acquisition Consideration, Share Price Business Acquisition, Acquisition Consideration, Share Price Acquisition share price determination, trading days before purchase agreement Business Acquisition, Share Price Determination, Threshold Trading Days Before Purchase Agreement Business Acquisition, Share Price Determination, Threshold Trading Days Before Purchase Agreement Acquisition share price determination, trading days after purchase agreement Business Acquisition, Share Price Determination, Threshold Trading Days After Purchase Agreement Business Acquisition, Share Price Determination, Threshold Trading Days After Purchase Agreement Purchase accounting provisions, share price (usd per share) Business Acquisition, Share Price Fixed future consideration Business Combination, Fixed Future Consideration, Amount Business Combination, Fixed Future Consideration, Amount Common stock fair value (usd per share) Business Combination, Fixed Future Consideration, Shares, Price Per Share Business Combination, Fixed Future Consideration, Shares, Price Per Share Future cash consideration Business Combination, Fixed Future Consideration, Cash Business Combination, Fixed Future Consideration, Cash Acquisition and integration related costs Business Combination, Acquisition and Integration Related Costs Business Combination, Acquisition and Integration Related Costs Accounts receivable and allowance for doubtful accounts balances Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Credit quality of the company's financing receivables using aging analysis Financing Receivable Credit Quality Indicators [Table Text Block] Provisions for write-offs and credit losses against OTA sales-type lease receivable balances Allowance for Credit Losses on Financing Receivables [Table Text Block] Inventories Schedule of Inventory, Current [Table Text Block] Prepaid expenses and other current assets Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Property and equipment Property, Plant and Equipment [Table Text Block] Equipment under capital leases Schedule of Capital Leased Assets [Table Text Block] Change in carrying value of goodwill Schedule of Goodwill [Table Text Block] Schedule of intangible assets and goodwill Schedule of Intangible Assets and Goodwill [Table Text Block] Other long-term assets Schedule of Other Assets, Noncurrent [Table Text Block] Accrued Expenses and Other Schedule of Accrued Liabilities [Table Text Block] Changes in warranty accrual Schedule of Product Warranty Liability [Table Text Block] Fair value of each option grant Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Summary of the effect of net income per common share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Number of potentially dilutive securities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Class of Warrant or Right, Outstanding [Roll Forward] Class of Warrant or Right, Outstanding [Roll Forward] Class of Warrant or Right, Outstanding [Roll Forward] Number of Shares Outstanding, Beginning of period (shares) Class of Warrant or Right, Outstanding Number of Shares Outstanding, Issued (shares) Class of Warrant or Right, Issued Class of Warrant or Right, Issued Number of Shares Outstanding, Exercised (shares) Class of Warrant or Right, Exercised Class of Warrant or Right, Exercised Number of Shares Outstanding, Cancelled (shares) Class of Warrant or Right, Cancelled Class of Warrant or Right, Cancelled Number of Shares Outstanding, End of period (shares) Number of shares outstanding, End of period (shares) Weighted Average Exercise Price, Beginning of Period (USD per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Weighted Average Exercise Price, Issued (USD per share) Class of Warrant or Right, Exercise Price of Warrants or Rights, Issued Class of Warrant or Right, Exercise Price of Warrants or Rights, Issued Weighted Average Exercise Price, Exercised (USD per share) Class of Warrant or Right, Exercise Price of Warrants or Rights, Exercised Class of Warrant or Right, Exercise Price of Warrants or Rights, Exercised Weighted Average Exercise Price, Cancelled (USD per share) Class of Warrant or Right, Exercise Price of Warrants or Rights, Cancelled Class of Warrant or Right, Exercise Price of Warrants or Rights, Cancelled Weighted Average Exercise Price, End of Period (USD per share) Weighted Average Exercise Price, End of Period (USD per share) Numerator: Earnings Per Share Reconciliation [Abstract] Net loss Net Income (Loss) Attributable to Parent Denominator: Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Weighted-average common shares outstanding (shares) Weighted Average Number of Shares Outstanding, Basic Weighted-average effect of assumed conversion of stock options and restricted stock (shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted-average common shares and share equivalents outstanding (shares) Weighted Average Number of Shares Outstanding, Diluted Net income (loss) per common share: Earnings Per Share [Abstract] Basic (usd per share) Earnings Per Share, Basic Diluted (usd per share) Earnings Per Share, Diluted Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] $1.62 - 2.20 Range Two [Member] Range 2 [Member] $2.41 - 2.75 Range Three [Member] Range 3 [Member] $2.86 - 4.28 Range Four [Member] Range 4 [Member] $4.49 - 4.76 Range Five [Member] Range 5 [Member] $5.35 - 5.44 Range Six [Member] Range 6 [Member] $9.00 Range Seven [Member] Range Seven [Member] $10.14 - 11.61 Range Eight [Member] Range Eight [Member] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Exercise Price Range, Lower Range Limit (usd per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Exercise Price Range, Upper Range Limit (usd per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Outstanding (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Weighted Average Remaining Contractual Life (Years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted Average Exercise Price (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Stockholders' Equity Note [Abstract] Shares issued from treasury Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2003 Stock Option and 2004 Stock and Incentive Awards Plans 2003 Stock Option and 2004 Stock and Incentive Awards Plans [Member] 2003 Stock Option and 2004 Stock and Incentive Awards Plans [Member] 2004 Stock and Incentive Awards Plan Two Thousand Four Stock and Incentive and Award Plan [Member] 2004 stock and incentive awards plan. Award Type [Domain] Non-Employee Director Non-Employee Director [Member] Non-Employee Director [Member] Reserved shares for issuance to key employees (shares) Common Stock, Capital Shares Reserved for Future Issuance Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Maximum life of option under the plan Share Based Compensation Arrangements by Share Based Payments Award Option Maximum Life Share-based compensation by share based payments award options maximum life. Vesting term for restricted shares Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Alternate vesting term for restricted shares Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Alternate Period for Recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Alternate Period for Recognition Restricted shares granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Per share price on grant date (USD per share) Share Based Compensation Arrangement By Share Based Payment Award Per Share Price Share based compensation arrangement by share based payment award per share price. Grant of shares to non-employees and consultants (shares) Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued Common stock closing price (usd per share) Fair Value Of Closing Common Stock Price Fair value of closing common stock price. Value of shares issued to consultants (usd per share) Share-based Goods and Nonemployee Services Transaction, Securities Issued Valuation Price Per Share Share-based Goods and Nonemployee Services Transaction, Securities Issued Valuation Price Per Share Compensation expense Allocated Share-based Compensation Expense Weighted average grant-date fair value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Warrants exercised (shares) Warrants exercised (usd per share) Concentration Risk [Table] Concentration Risk [Table] U.S. Markets Energy Management [Member] Energy Management Member. Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Cost of Goods Cost of Goods, Total [Member] Sales Sales [Member] Accounts Receivable Accounts Receivable [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Supplier Concentration Risk Supplier Concentration Risk [Member] Customer Concentration Risk Customer Concentration Risk [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Number of financial institutions (financial institution) Number of Financial Institutions Number of Financial Institutions Concentration risk, number of entities Concentration Risk, Number of Entities Involved in Risk Calculation Concentration Risk, Number of Entities Involved in Risk Calculation Concentration risk, percentage Concentration Risk, Percentage Schedule of Capital Leased Assets [Table] Schedule of Capital Leased Assets [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Assets Held under Capital Leases Assets Held under Capital Leases [Member] Capital Leased Assets [Line Items] Capital Leased Assets [Line Items] Equipment Property, Plant and Equipment, Gross Less: accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Net property and equipment Property, Plant and Equipment, Net Income Tax Disclosure [Abstract] Current Current Income Tax Expense (Benefit) Deferred Deferred Income Tax Expense (Benefit) Total provision (benefit) for income taxes Income Tax Expense (Benefit) Federal Federal Income Tax Expense (Benefit), Continuing Operations State State and Local Income Tax Expense (Benefit), Continuing Operations Fiscal 2017 Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Next Twelve Months Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Next Twelve Months Fiscal 2018 Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Due in Two Years Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Due in Two Years Fiscal 2019 Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Due in Three Years Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Due in Three Years Fiscal 2020 Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Due in Four Years Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Due in Four Years Fiscal 2021 Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Due in Five Years Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Due in Five Years Thereafter Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Due Thereafter Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Due Thereafter Total compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Remaining weighted average expected term Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Domestic Country Domestic Tax Authority [Member] State And Local Jurisdiction State and Local Jurisdiction [Member] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Operating loss carryforwards Operating Loss Carryforwards Exercise of NQSOs Operating Loss Carryforwards Associated with Exercise of Non Qualified Stock Options Exercise of non qualified stock options. Tax credit carryforwards Tax Credit Carryforward, Amount Valuation allowance Deferred Tax Assets, Valuation Allowance Increase in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Examination period for state income tax returns Period of Time State Income Tax Returns Subject to Examination Period of Time State Income Tax Returns Subject to Examination Unrecognized tax benefits Unrecognized Tax Benefits Statement of Cash Flows [Abstract] Operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash provided by (used in) Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation Depreciation Amortization Amortization Stock-based compensation expense Share-based Compensation Accretion of fair value on contingent consideration Accretion Expense Deferred income tax (benefit) expense Deferred Income Taxes and Tax Credits Impairment on assets Asset Impairment Charges Loss (gain) on sale of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Provision for inventory reserves Inventory Write-down Provision for bad debts Provision for Doubtful Accounts Other Other Noncash Income (Expense) Changes in operating assets and liabilities, net of changes from acquisitions: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable, current and long-term Increase (Decrease) in Accounts Receivable Inventories, current and long-term Increase (Decrease) in Inventories Deferred contract costs Increase (Decrease) in Deferred Charges Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses and other Increase (Decrease) in Accrued Liabilities Deferred revenue, current and long-term Increase (Decrease) in Deferred Revenue Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Operating Activities Investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash paid for acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Purchase of short-term investments Payments to Acquire Short-term Investments Sale of short-term investments Proceeds from Sale of Short-term Investments Additions to patents and licenses Payments to Acquire Intangible Assets Proceeds from sales of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Payment of long-term debt Repayments of Long-term Debt Proceeds from revolving credit facility Proceeds from Long-term Lines of Credit Repayments of revolving credit facility Repayments of Long-term Lines of Credit Proceeds from long-term debt Proceeds from Issuance of Debt Proceeds from repayment of shareholder notes Proceeds from Related Party Debt Proceeds from issuance of common stock, net of issuance costs Proceeds from Issuance of Common Stock Payments to settle employee tax withholdings on stock-based compensation Payments Related to Tax Withholding for Share-based Compensation Deferred financing costs Payments of Financing Costs Net proceeds from employee equity exercises Proceeds from Exercise of Warrants and Stock Options Proceeds from Exercise of Warrants and Stock Options Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid Cash paid for income taxes Income Taxes Paid Supplemental disclosure of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Vendor financed capital lease addition Capital Lease Obligations Incurred Shares returned to treasury in satisfaction of receivable Other Significant Noncash Transaction, Value of Consideration Received Acquisition related contingent consideration liability NoncashOrPartNoncashAcquisitionNoncashContingentConsiderationLiability NoncashOrPartNoncashAcquisitionNoncashContingentConsiderationLiability Acquisition financed through debt Noncash or Part Noncash Acquisition, Debt Assumed Common stock issued for acquisition NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationIssued The value of shares issued as [noncash or part noncash] consideration for a business or asset acquired. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Income Statement [Abstract] Product revenue Sales Revenue, Goods, Net Service revenue Sales Revenue, Services, Net Total revenue Cost of product revenue Cost of Goods Sold Cost of service revenue Cost of Services Total cost of revenue Cost of Revenue Gross profit (loss) Gross Profit Operating expenses: Operating Expenses [Abstract] General and administrative General and Administrative Expense Goodwill and long lived asset impairment Goodwill, Impairment Loss And Impairment Of Real Estate Goodwill, Impairment Loss And Impairment Of Real Estate Acquisition and integration related expenses Business Combination, Acquisition Related Costs Sales and marketing Selling and Marketing Expense Research and development Research and Development Expense Total operating expenses Operating Expenses Loss from operations Other income (expense): Nonoperating Income (Expense) [Abstract] Interest expense Interest Expense Interest income Investment Income, Interest Total other income (expense) Nonoperating Income (Expense) Loss before income tax Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense (benefit) Net loss and comprehensive loss Basic net loss per share attributable to common shareholders (usd per share) Diluted net loss per share (usd per share) Weighted-average common shares and share equivalents outstanding (shares) SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Weighted average expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected forfeiture rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate Share based compensation arrangement by share based payment award fair value assumptions expected forfeiture rate. Long-term debt Schedule of Debt [Table Text Block] Schedule of maturities of long-term debt Schedule of Maturities of Long-term Debt [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Fiscal 2017 Operating Leases, Future Minimum Payments Due, Next Twelve Months Fiscal 2018 Operating Leases, Future Minimum Payments, Due in Two Years Fiscal 2019 Operating Leases, Future Minimum Payments, Due in Three Years Fiscal 2020 Operating Leases, Future Minimum Payments, Due in Four Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total future payments due Operating Leases, Future Minimum Payments Due Summary of Significant Accounting Policies [Table] Summary of Significant Accounting Policies [Table] Summary of Significant Accounting Policies [Table] Sale Leaseback Transaction, Description [Axis] Sale Leaseback Transaction, Description [Axis] Sale Leaseback Transaction, Name [Domain] Sale Leaseback Transaction, Name [Domain] Manitowoc Manufacturing and Distribution Facility Manitowoc Manufacturing and Distribution Facility [Member] Manitowoc Manufacturing and Distribution Facility [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Construction in progress Construction in Progress [Member] Summary of Significant Accounting Policies [Line Items] Summary of Significant Accounting Policies [Line Items] [Line Items] for Summary of Significant Accounting Policies [Table] Summary of Significant Accounting Policies (Textual) [Abstract] Summary of Significant Accounting Policies (Textual) [Abstract] Summary of significant accounting policies. Accounts receivable, minimum period due Accounts Receivables Due Minimum Period Accounts receivables due minimum period. Accounts receivable, maximum period due Accounts Receivables Due Maximum Period Accounts receivables due maximum period. Inventory consideration usage Inventory Reserve, Length of Time of Inventory Usage Considered Inventory Reserve, Length of Time of Inventory Usage Considered Deferred contract costs Deferred Costs, Current Cash purchase price Sale Leaseback Transaction, Gross Proceeds, Investing Activities Area of leased property (sqft) Sale Leaseback Transaction, Area of Leased Property Sale Leaseback Transaction, Area of Leased Property Sale leaseback term Sale Leaseback Transaction, Lease Term Sale Leaseback Transaction, Lease Term Impairment charge as a result of purchase and sale agreement Impairment of Real Estate Number of reportable segments (segment) Number of Reportable Segments Impairment charge Property, Plant and Equipment Impairment Expense Property, Plant and Equipment Impairment Expense Interest capitalized for construction in progress Interest Costs Capitalized Goodwill Goodwill Goodwill impairment charge Goodwill, Impairment Loss Impairment write-off of intangible assets Impairment of Intangible Assets (Excluding Goodwill) Debt useful life, minimum Deferred Financing costs Amortized Over Useful Life Of Debt Issue Minimum Deferred Financing costs Amortized Over Useful Life Of Debt Issue Minimum. Debt useful life, maximum Deferred Financing costs Amortized Over Useful Life Of Debt Issue Maximum Deferred Financing costs Amortized Over Useful Life Of Debt Issue Maximum. Interest expense Amortization of Debt Issuance Costs Limited warranty term Limited Product Warranty, Term Limited Product Warranty, Term Warranty reserves Standard and Extended Product Warranty Accrual Solar power systems completion period minimum Solar Power Systems Completion Period Minimum Solar power systems completion period minimum. Solar power systems completion period maximum Solar Power Systems Completion Period Maximum Solar power systems completion period maximum. Power purchase agreement product revenue is recognized term Power Purchase Agreement Product Revenue Recognizable Term Power purchase agreement product revenue recognizable term. Advertising costs Advertising Expense Deferred tax assets valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Tax benefit (expense) INCOME TAXES Income Tax Disclosure [Text Block] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Number of Shares, Beginning Balance (shares) Number of Shares, Granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Number of Shares, Exercised (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of Shares, Forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Number of Shares, Ending Balance (shares) Number of Shares, Exercisable (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted Average Exercise Price, Beginning Balance (in dollars per share) Weighted Average Exercise Price, Granted Stock Options (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted Average Exercise Price, Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted Average Exercise Price, Forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Weighted Average Exercise Price, Ending Balance (in dollars per share) Weighted Average Fair Value of Options Granted (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Aggregate Intrinsic Value, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate Intrinsic Value, Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Land improvements Land Improvements [Member] Buildings and building improvements Building and Building Improvements [Member] Furniture, fixtures and office equipment Furniture and Fixtures [Member] Equipment leased to customers under Power Purchase Agreements Equipment Leased to Other Party [Member] Plant equipment Equipment [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Depreciation using the straight-line method Property, Plant and Equipment, Net [Abstract] Property, plant and equipment, useful life Property, Plant and Equipment, Useful Life Schedule of segment information Schedule of Segment Reporting Information, by Segment [Table Text Block] Unbilled accounts receivable Unbilled Receivables, Current Other prepaid expenses Other Prepaid Expense, Current Total Prepaid Expense and Other Assets, Current COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Reconciliation of Unrecognized Tax Benefits [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized tax benefits as of beginning of fiscal year Additions based on tax positions related to the current period positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Unrecognized tax benefits as of end of fiscal year Stock-based compensation Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Number of shares available for grant Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Summary of outstanding stock options Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of range of exercise prices Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Summary of restricted shares granted Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of unrecognized compensation cost related to non-vested awards Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block] Warrants outstanding rollforward Schedule of Warrants Outstanding Rollforward [Table Text Block] Schedule of Warrants Outstanding Rollforward [Table Text Block] SEGMENT DATA Segment Reporting Disclosure [Text Block] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Beginning of year Provision to product cost of revenue Standard and Extended Product Warranty Accrual, Increase for Warranties Issued Charges Standard and Extended Product Warranty Accrual, Decrease for Payments End of year Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock, Shares Common Stock [Member] Common Stock, Additional Paid-in Capital Common Stock Including Additional Paid in Capital [Member] Treasury Stock Treasury Stock [Member] Shareholder Notes Receivable Notes Receivable [Member] Retained Earnings (Deficit) Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Shareholders' equity, at beginning of period (shares) Shares, Outstanding Shareholders' equity, beginning of period Stockholders' Equity Attributable to Parent Issuance of stock and warrants for services (shares) Stock Issued During Period, Shares, Issued for Services Issuance of stock and warrants for services Stock Issued During Period, Value, Issued for Services Stock activity for acquisition (shares) Stock Issued During Period, Shares, Acquisitions Stock activity for acquisition Stock Issued During Period, Value, Acquisitions Issuance of common stock for cash, net of issuance costs (shares) Stock Issued During Period, Shares, New Issues Issuance of common stock for cash, net of issuance costs Stock Issued During Period, Value, New Issues Exercise of stock options and warrants for cash (shares) StockIssuedDuringPeriodSharesStockOptionsandWarrantsExercised Number of share options and warrants exercised during the current period Exercise of stock options and warrants for cash Stock Issued During Period, Value, Stock Options and Warrants Exercised Stock Issued During Period, Value, Stock Options and Warrants Exercised Shares issued under Employee Stock Purchase Plan (shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Shares issued under Employee Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Tax benefit from exercise of stock options Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Collection of shareholder notes receivable Stockholders' Equity, Receivable from Shareholders or Affiliates for Issuance of Capital Stock Stockholders' Equity, Receivable from Shareholders or Affiliates for Issuance of Capital Stock Stock-based compensation (shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Treasury stock purchase (shares) Treasury Stock, Shares, Acquired Treasury stock purchase Treasury Stock, Value, Acquired, Cost Method Employee tax withholdings on stock-based compensation (shares) Shares Paid for Tax Withholding for Share Based Compensation Employee tax withholdings on stock-based compensation Adjustments Related to Tax Withholding for Share-based Compensation Net income (loss) Shareholders' equity, at end of period (shares) Shareholders' equity, end of period Schedule Of Extinguishment Of Debt [Table] Schedule of Extinguishment of Debt [Table] Extinguishment of Debt [Axis] Extinguishment of Debt [Axis] Extinguishment of Debt, Type [Domain] Extinguishment of Debt, Type [Domain] Revolving credit facility Revolving Credit Facility [Member] Harris seller's note Harris Seller's Note [Member] Harris Seller's Note [Member] Equipment lease obligations Capital Lease Obligations [Member] Customer equipment finance notes payable Customer Equipment Finance Notes Payable [Member] Customer equipment finance notes payable. Other long-term debt Other Long Term Debt [Member] Other long term debt. Extinguishment of Debt [Line Items] Extinguishment of Debt [Line Items] Long-term debt Long-term Debt, by Current and Noncurrent [Abstract] Current maturities Long-term Debt, Current Maturities Long-term debt, less current maturities Long-term Debt, Excluding Current Maturities Raw material and components, cost Inventory, Raw Materials and Supplies, Gross Raw materials and components, obsolescence reserve Inventory, Raw Materials and Supplies, Valuation Reserves Inventory, Raw Materials and Supplies, Valuation Reserves Raw materials and components Inventory, Raw Materials and Supplies, Net of Reserves Work in process, cost Inventory, Work in Process, Gross Work in process, obsolescence reserve Inventory, Work in Process, Valuation Reserves Inventory, Work in Process, Valuation Reserves Work in process Inventory, Work in Process, Net of Reserves Finished goods, cost Inventory, Finished Goods, Gross Finished goods, obsolescence reserve Inventory, Finished Goods, Valuation Reserves Inventory, Finished Goods, Valuation Reserves Finished goods Inventory, Finished Goods, Net of Reserves Total cost Inventory, Gross Total obsolescence reserve Inventory Valuation Reserves Total Inventory, Net Line of Credit Facility [Table] Line of Credit Facility [Table] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Wells Fargo Bank, National Association Wells Fargo Bank, National Association [Member] Wells Fargo Bank, National Association [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Credit Agreement Credit Agreement [Member] Credit Agreement Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Letter of Credit Letter of Credit [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Debt (Textual) [Abstract] Debt (Textual) [Abstract] Long term debt. Current borrowings under credit facility Line of Credit Facility, Current Borrowing Capacity Maximum borrowing capacity under credit facility Line of Credit Facility, Maximum Borrowing Capacity Minimum indebtedness ratio Line of Credit Facility, Covenant Terms, Minimum Indebtedness Ratio Line of Credit Facility, Covenant Terms, Minimum Indebtedness Ratio Spread on basis rate (percentage) Debt Instrument, Basis Spread on Variable Rate Interest charge Debt Instrument, Periodic Payment, Interest Effective interest rate, percentage Debt Instrument, Interest Rate, Effective Percentage Commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Outstanding letters of credit totaling Letters of Credit Outstanding, Amount Revolving credit facility Long-term Line of Credit, Noncurrent Additional borrowing capacity Line of Credit Facility, Additional Borrowing Capacity Line of Credit Facility, Additional Borrowing Capacity Inventory, accruals and reserves Deferred Tax Assets, Inventory, Accruals and Reserves Deferred Tax Assets, Inventory, Accruals and Reserves Other Deferred Tax Assets, Other Deferred revenue Deferred Tax Asset, Deferred Income, Current Deferred Tax Asset, Deferred Income, Current Valuation allowance Deferred Tax Assets, Valuation Allowance, Current Total net current deferred tax assets and liabilities Deferred Tax Assets, Net of Valuation Allowance, Current Federal and state operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards Non-qualified stock options Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Deferred revenue Deferred Tax Asset, Deferred Income, Noncurrent Deferred Tax Asset, Deferred Income, Noncurrent Fixed assets Deferred Tax Liabilities, Property, Plant and Equipment Intangible assets Deferred Tax Liabilities, Goodwill and Intangible Assets Valuation allowance Deferred Tax Assets, Valuation Allowance, Noncurrent Total net long-term deferred tax assets and liabilities Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Total net deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Financing Receivable Type [Axis] Financing Receivable Type [Axis] Financing Receivable Type [Axis] Financing Receivable Type [Domain] Financing Receivable Type [Domain] [Domain] for Financing Receivable Type [Axis] Not Past Due Not Past Due [Member] Not past due. 1-90 days past due One To Ninety Days [Member] One to ninety days. Greater than 90 days past due Greater Than Ninety Days [Member] Greater than ninety days. Total past due Past Due Lease Net [Member] Past due lease net. Total sales-type leases Sales Type Net [Member] Sales type net. Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Credit quality of the Company's financing receivables using Aging Analysis Accounts, Notes, Loans and Financing Receivable, Classified [Abstract] Lease balances included in consolidated accounts receivable—current Accounts, Notes, Loans and Financing Receivable, Net, Current Lease balances included in consolidated accounts receivable—long-term Accounts, Notes, Loans and Financing Receivable, Net, Noncurrent Total gross sales-type leases Accounts Receivable, Gross, Current Allowance Allowance for Doubtful Accounts Receivable, Current Total net sales-type leases Accounts Receivable, Net, Current Allowance for Doubtful Accounts Receivable [Roll Forward] Allowance for Doubtful Accounts Receivable [Roll Forward] Allowance for doubtful accounts on financing receivables, beginning of period Allowance for Doubtful Accounts Receivable Provisions charged to expense Write offs and other Allowance for Doubtful Accounts Receivable, Write-offs Allowance for doubtful accounts on financing receivables, end of period Subsequent Events [Abstract] SUBSEQUENT EVENTS Subsequent Events [Text Block] Document and Entity Information [Abstract] Document and entity information. Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of Employee Stock Ownership Plan (ESOP) Disclosures [Table] Schedule of Employee Stock Ownership Plan (ESOP) Disclosures [Table] Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] Shares issued from treasury Summary Of Issuance Of Stock Under Employee Stock Ownership Plan [Abstract] Summary of Issuance of Stock Under Employee Stock Ownership Plan. Shares Issued Under ESPP Plan (shares) Closing Market Price (usd per share) Employee Stock Purchase Plan Closing Market Price Of Shares Purchased Employee stock purchase plans weighted averages purchase price of shares purchased. Shares Issued Under Loan Program (shares) Employee Stock Purchase Plans Debt Structure Shares Issued Employee stock purchase plans debt structure shares issued. Dollar Value of Loans Issued Employee Stock Purchase Plans Debt Structure Direct Loan Amount Employee stock purchase plans debt structure direct loan amount. Repayment of Loans Employee Stock Purchase Plans Debt Structure Direct Loan Repayment Amount Employee stock purchase plans debt structure direct loan repayment amount. Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Income Statement Location [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Income Statement Location [Domain] Cost of product revenue Cost of Sales [Member] General and administrative General and Administrative Expense [Member] Sales and marketing Selling and Marketing Expense [Member] Research and development Research and Development Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Stock-based compensation Share-based Compensation, Allocation and Classification in Financial Statements [Abstract] Land and land improvements Leasehold improvements Leasehold Improvements [Member] Equipment leased to customers under Power Purchase Agreements Plant equipment Property, Plant and Equipment, Other Types [Member] Property and equipment Gross property and equipment Compensation and benefits Employee-related Liabilities, Current Sales tax Sales and Excise Tax Payable, Current Contract costs Accrued Contract Costs, Current Accrued Contract Costs, Current Legal and professional fees Accrued Professional Fees, Current Warranty Product Warranty Accrual, Current Other accruals Other Accrued Liabilities, Current Total Accrued Liabilities, Current Loss contingency Loss Contingency Accrual Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Shares outstanding, beginning of the period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Shares issued (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Shares vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Shares forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Shares outstanding, end of the period (shares) Per share price on grant date (usd per share) Accounts receivable, gross Allowance for doubtful accounts SHAREHOLDERS' EQUITY Stockholders' Equity Note Disclosure [Text Block] Statement of Financial Position [Abstract] Preferred stock, par value (usd per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized (shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (shares) Preferred Stock, Shares Outstanding Common stock, par value (usd per share) Common Stock, No Par Value Common stock, shares authorized (shares) Common Stock, Shares Authorized Common stock, shares issued (shares) Common Stock, Shares, Issued Common stock, shares outstanding (shares) Treasury stock (shares) Treasury Stock, Shares Total Assets Assets Deferred Revenue Deferred Revenue LONG-TERM DEBT Long-term Debt [Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Secured Debt Secured Debt [Member] June 2011 OTA Finance Program June 2011 OTA Finance Program [Member] June 2011 OTA Finance Program [Member] Agreement with Wisconsin Department of Commerce Agreement with Wisconsin Department of Commerce [Member] Agreement with Wisconsin Department of Commerce [Member] December 2014 OTA Finance Program December 2014 OTA Finance Program [Member] December 2014 OTA Finance Program [Member] De Lage Landen Financial Services, Inc. De Lage Landen Financial Services, Inc. [Member] De Lage Landen Financial Services, Inc. [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt instrument, face amount Debt Instrument, Face Amount Stated interest rate, percentage Debt Instrument, Interest Rate, Stated Percentage Number of lease agreements (lease agreement) Number of Lease Agreements Number of Lease Agreements Principal amount of debt Long-term Debt, Gross Value of buyout option Debt Instrument, Buyout Option Debt Instrument, Buyout Option Principal amount of secured debt Secured Debt Number of individual OTA customer contracts (contract) Debt Instrument, Number Of Contracts For Collateral Debt Instrument, Number of Customer Contracts Number of supporting individual OTA customer contracts (contract) Number of Supporting Individual OTA Customer Contracts Number of Supporting Individual OTA Customer Contracts Debt instrument, covenant compliance, aggregate amount of all remaining scheduled payments due of individual OTA contracts versus remaining principal and interest payments due (not less than) Debt Instrument, Covenant Compliance, Aggregate Amount of All Remaining Scheduled Payments Due of Individual OTA Contracts To Remaining Principal and Interest Payments Due under Loan Debt Instrument, Covenant Compliance, Aggregate Amount of All Remaining Scheduled Payments Due of Individual OTA Contracts to Remaining Principal and Interest Payments Due under Loan Period of time without interest accruing or principal payments due Period of Time without Interest Accruing or Principal Payments Due Period of Time without Interest Accruing or Principal Payments Due Monthly principal and interest payment Debt Instrument, Periodic Payment Schedule of components of income tax expense (benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Reconciliation of the statutory federal income tax rate and the effective income tax rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Unrecognized tax benefit activity Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Statutory federal tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State taxes, net Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Federal tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent State tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent Change in valuation reserve Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Permanent items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Change in tax contingency reserve Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Schedule of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Contingent consideration maximum amount of liability Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Contingent consideration minimum amount of liability Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low Contingent consideration, reduction in liability during period Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Contingent consideration, reduction in liability during the period, additional earn-out expense Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Additional Adjustment, Liability Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Additional Adjustment, Liability Assets [Abstract] Cash and cash equivalents Accounts receivable, net Inventories, net Prepaid expenses and other current assets Total current assets Assets, Current Property and equipment, net Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) Long-term accounts receivable Accounts Receivable, Net, Noncurrent Other long-term assets Total assets Liabilities and Equity [Abstract] Accounts payable Accounts Payable, Current Accrued expenses and other Deferred revenue, current Deferred Revenue, Current Current maturities of long-term debt Total current liabilities Liabilities, Current Long-term debt, less current maturities Other Long-term Debt, Noncurrent Deferred revenue, long-term Deferred Revenue, Noncurrent Other long-term liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Shareholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.01 par value: Shares authorized: 30,000,000 shares at March 31, 2016 and 2015; no shares issued and outstanding at March 31, 2016 and 2015 Preferred Stock, Value, Issued Common stock, no par value: Shares authorized: 200,000,000 at March 31, 2016 and 2015; shares issued: 37,192,559 and 36,837,864 at March 31, 2016 and 2015; shares outstanding: 27,767,138 and 27,421,533 at March 31, 2016 and 2015 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Treasury stock: 9,425,421 and 9,416,331 common shares at March 31, 2016 and 2015 Treasury Stock, Value Shareholder notes receivable Receivable from Shareholders or Affiliates for Issuance of Capital Stock Retained deficit Retained Earnings (Accumulated Deficit) Total shareholders’ equity Total liabilities and shareholders’ equity Liabilities and Equity ACQUISITION Business Combination Disclosure [Text Block] Long-term Purchase Commitment [Table] Long-term Purchase Commitment [Table] Income Statement Location [Axis] Income Statement Location [Domain] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Inventories Inventories [Member] Long-term Purchase Commitment [Line Items] Long-term Purchase Commitment [Line Items] Rent expense under operating leases Operating Leases, Rent Expense, Net Initial lease term Lessor Leasing Arrangements, Operating Leases, Term of Contract Number of extension options (extension option) Lessor Leasing Arrangements, Operating Leases, Number of Extension Options Lessor Leasing Arrangements, Operating Leases, Number of Extension Options Extended lease term Lessor Leasing Arrangements, Operating Leases, Renewal Term Monthly rental payment receivable Operating Leases, Monthly Rental Payments Receivable Operating Leases, Monthly Rental Payments Receivable Purchase commitments Purchase Obligation, Due in Next Twelve Months Discretionary company contributions to retirement savings plan Defined Contribution Plan, Employer Discretionary Contribution Amount Number of claims dismissed (claim) Loss Contingency, Claims Dismissed, Number Class of Treasury Stock [Table] Class of Treasury Stock [Table] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] October 2011 October 2011 [Member] October 2011 [Member] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Offering price, per share (USD per share) Shares Issued, Price Per Share Issuance of common stock for cash, net of issuance costs Stock repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Treasury stock purchase (shares) Repurchase of common stock into treasury Payments for Repurchase of Common Stock Common stock purchased per right (shares) Class of Warrant or Right, Number of Securities Called by Each Warrant or Right Right issue share price (USD per share) Right issue Share Price Right issue share price. Minimum subscription percentage Minimum Subscription Percentage Minimum Subscription Percentage Number of business days to trigger a distribution date Rights Distribution Date, Trigger, Number of Business Days After Commencement or Offer of Acquisition Number of business days after the commencement of, or the announcement of an intention to make, a tender offer or exchange offer that would result in any such person or group of persons acquiring such beneficial ownership. Share acquisition percentage Acquisition Share Void Percentage Acquisition share void percentage. Prior to a person becoming an acquiring person, the board of directors of the company's redemption rate (USD per share) Share Purchase Rights Redemption Price Share purchase rights redemption price. Employee stock purchase plan, shares authorized (shares) Employee Stock Purchase Plans Shares Authorized Employee stock purchase plans shares authorized. Maximum amount limit for ESPP per employee Maximum Amount Limit For Employee Stock Purchase Plan Per Employee Maximum amount limit for employee stock purchase plan per employee. Purchase price to market price matching percentage Employee Stock Purchase Plan Purchase Price to Market Price Matching Percentage Purchase price to market price matching percentage. Sec 16 Officers limit percentage on ESPP based on annual income Employee Stock Purchase Plan Allowed Loan Amount Percentage Of Annual Income Allowed loan amount percentage of annual income. Sec 16 officers maximum limit on ESPP in amounts Employee Stock Purchase Plans Loan Maximum Outstanding Amount Employee stock purchase plans loan maximum outstanding amount. Period of interest on loans Employee Stock Purchase Plan, Loan IRS Interest Rate Employee Stock Purchase Plan, Loan IRS Interest Rate STOCK OPTIONS, RESTRICTED SHARES AND WARRANTS Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Patents Patents [Member] Licenses Licensing Agreements [Member] Trade name and trademarks Trademarks and Trade Names [Member] Customer relationships Customer Relationships [Member] Developed technology Developed Technology Rights [Member] Non-competition agreements Noncompete Agreements [Member] Cost of Sales Operating Expenses Operating Expense [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill, beginning balance Impairments Goodwill, ending balance Gross Carrying Amount Finite-Lived and Indefinite-Lived Intangible Assets, Gross Finite-Lived and Indefinite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Intangible Assets, Net Intangible assets, useful life Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Assets, Estimated Amortization Expense Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Fiscal 2017 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Fiscal 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Two Fiscal 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Three Fiscal 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Four Fiscal 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Total Finite-Lived Intangible Assets, Net Amortization expense Amortization of Intangible Assets Schedule of annual commitments under non-cancellable operating leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Selected Quarterly Financial Information [Abstract] Selected Quarterly Financial Information [Abstract] Total revenue Gross profit Basic net income per share (in usd per share) Shares used in basic per share calculation Diluted net income per share (in usd per share) Shares used in diluted per share calculation Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Common stock warrants Warrant [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Number of potentially dilutive securities Antidilutive Shares Excluded From Computation Of Earnings Per Share [Abstract] Antidilutive Shares excluded from computation of earnings per share. Number of potentially dilutive securities (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] DESCRIPTION OF BUSINESS Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]