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Accounting Standards Update 2014-09 Accounting Standards Update 2014-09 [Member] Common stock, $0.001 par value; 100,000 shares authorized; 34,423 and 34,104 shares issued Common Stock, Value, Issued ASSETS Assets [Abstract] Keyboards Keyboards [Member] Keyboards [Member] Accounts Receivable Accounts Receivable [Member] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Range [Axis] Range [Axis] Beginning balance Ending balance Indefinite-Lived Intangible Assets (Excluding Goodwill) Cash and cash equivalents Cash and cash equivalents at beginning of the period Cash and cash equivalents at end of the period Cash and Cash Equivalents, at Carrying Value Accounts payable Increase (Decrease) in Accounts Payable Deferred revenue Deferred revenue Deferred Revenue, Current Deferred income tax assets Deferred Income Tax Assets, Net SUBSEQUENT EVENTS Subsequent Events [Text Block] Business Acquisition [Axis] Business Acquisition [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Accrued liabilities Increase (Decrease) in Accrued Liabilities Sales returns liability Customer Refund Liability, Current Document Fiscal Year Focus Document Fiscal Year Focus Treasury stock, 6,247 and 6,065 common shares at cost Treasury Stock, Value Total assets Assets Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Title of Individual [Axis] Title of Individual [Axis] Scenario [Axis] Scenario [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Impairment of intangible assets Impairment loss on patent Impairment of Intangible Assets, Finite-Lived, Gross Impairment of Intangible Assets, Finite-Lived, Gross Document Fiscal Period Focus Document Fiscal Period Focus Loss on deferred loan costs with debt modification Loss On Deferred Debt Issuance Costs With Debt Modification Loss On Deferred Debt Issuance Costs With Debt Modification Deferred income tax expense Deferred Income Tax Expense (Benefit) Document Type Document Type Other assets Other Assets, Noncurrent Power Cases Power Cases [Member] Power Cases [Member] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Condensed Consolidated Statements of Operations changes Income Statement [Abstract] Sales returns liability Increase (Decrease) In Sales Return Liability The increase (decrease) during the reporting period in the liability for sales returns. 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