Supplemental Cash Flow Elements [Abstract] Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Accounts receivable Increase (Decrease) in Accounts Receivable Inventories Increase (Decrease) in Inventories Income taxes receivable Increase (Decrease) in Income Taxes Receivable Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense Income taxes payable Increase (Decrease) in Income Taxes Payable Accounts payable Increase (Decrease) in Accounts Payable Accrued liabilities Increase (Decrease) in Accrued Liabilities Other liabilities Increase (Decrease) in Other Operating Liabilities Net change Increase (Decrease) in Operating Capital Net cash paid (refunded) during the year for: Supplemental Cash Flow Information [Abstract] Income taxes Income Taxes Paid, Net Interest Interest Paid Property, Plant and Equipment, Net [Abstract] Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Unauthorized Transactions, Costs and Related Recoveries, Net [Abstract] Unauthorized Transactions, Costs and Related Recoveries, Net [Abstract] Unauthorized Transaction Related Costs and Recoveries Unauthorized Transaction Related Costs and Recoveries [Text Block] This element represents the complete disclosure related to unauthorized transactions. Additional Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Stock Purchase Agreement Disclosure [Abstract] -- None. No documentation exists for this element. -- Stock Purchase Agreements Stock Purchase Derivative Liability and Treasury Stock [Text Block] Stock Purchase Derivative Liability and Treasury Stock [Text Block] Standard Product Warranty Disclosure [Abstract] Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Balance, beginning of year Standard Product Warranty Accrual Provision charged to expense Standard Product Warranty Accrual, Period Increase (Decrease) Warranty expenses incurred Product Warranty Expense Balance, end of year Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Accounting Policies [Abstract] Wholly owned former subsidiary, ownership percentage Equity Method Investment, Ownership Percentage Research and development expensed Research and Development Expense Advertising costs expensed Advertising Expense Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Expected stock price volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected forfeitures Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Forfeiture Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Forfeiture Rate Expected life of options Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Statement, Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, less allowance for doubtful accounts of $51,854 and $55,872, respectively Accounts Receivable, Net, Current Inventories Inventory, Net Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Income taxes receivable Income Taxes Receivable, Current Total current assets Assets, Current Equipment and leasehold improvements, net Property, Plant and Equipment, Net Other assets: Assets Noncurrent Excluding Equipment And Leasehold Improvements [Abstract] -- None. No documentation exists for this element. -- Deferred income taxes Deferred Income Tax Assets, Net Cash surrender value of life insurance Cash Surrender Value of Life Insurance Total other assets Assets Noncurrent Excluding Equipment and Leasehold Improvements Sum of the carrying amounts as of the balance sheet date of all assets excluding property, plant and equipment that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer. Total assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued liabilities Accrued Liabilities, Current Dividends payable Dividends Payable, Current Income taxes payable Taxes Payable, Current Total current liabilities Liabilities, Current Long-term liabilities: Liabilities, Noncurrent [Abstract] Deferred compensation Deferred Compensation Liability, Classified, Noncurrent Other liabilities Other Liabilities, Noncurrent Total long-term liabilities Liabilities, Noncurrent Total liabilities Liabilities Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.005 par value, authorized 20,000,000 shares; issued and outstanding 7,382,706 shares Common Stock, Value, Issued Paid in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Income Statement [Abstract] Net sales Revenue, Net Cost of goods sold Cost of Goods and Services Sold Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Selling, general and administrative expenses Selling, General and Administrative Expense Unauthorized transaction related (recoveries) costs, net Unauthorized Transaction Related Costs (Recoveries), Net This element represents the total of net expenses related to recognition of unauthorized transactions in accounts during the reporting period from the previous years, for example, legal expenses recoveries denote recoveries from insurance claims. Other expense (income): Nonoperating Income (Expense) [Abstract] Interest expense Interest Expense (Loss) before income tax provision Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax provision Income Tax Expense (Benefit) Net (loss) Net Income (Loss) Attributable to Parent (Loss) per common share: Earnings Per Share [Abstract] Basic Earnings Per Share, Basic Diluted Earnings Per Share, Diluted Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Retirement Benefits [Abstract] Koss Employee Stock Ownership Trust (KESOT), cash contributions Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP Schedule of Product Warranty Liability Schedule of Product Warranty Liability [Table Text Block] Foreign Sales and Significant Customers [Abstract] Foreign Sales and Significant Customers [Abstract] Foreign Sales and Significant Customers Foreign Sales and Significant Customers [Text Block] Foreign Sales and Significant Customers [Text Block] Deferred Compensation Arrangements [Abstract] 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 Compensation Arrangement with Individual, Postretirement Benefits, by Title of Individual [Axis] Title of Individual [Axis] Title of Individual with Relationship to Entity [Domain] Relationship to Entity [Domain] Former Chairman of the Board Board of Directors Chairman [Member] Officer of Company Officer [Member] Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] Discount factor Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Deferred compensation paid Deferred Compensation Arrangement with Individual, Distribution Paid Deferred Compensation Liability Deferred Compensation Arrangement with Individual, Recorded Liability Expense Deferred Compensation Arrangement with Individual, Compensation Expense Cash compensation - percent of base salary times number of years of service Deferred compensation, cash compensation, percent of base salary times number of years of service Deferred compensation, cash compensation, percent of base salary times number of years of service Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Sales Revenue, Net [Member] Sales Revenue, Net [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Customer [Axis] Customer [Axis] Top five customers [Domain] Customer [Domain] Five largest customers [Member] Five largest customers [Member] Five largest customers [Member] Single Scandinavian Customer [Member] Single Scandinavian Customer [Member] Single Scandinavian Customer [Member] Single United States Customer [Member] Single United States Customer [Member] Single United States Customer [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Concentration Risk, Percentage Concentration Risk, Percentage Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Option vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Option term Share-based Compensation Arrangement by Share-based Payment Award, Term Share-based Compensation Arrangement by Share-based Payment Award, Term Shares of common stock added to stock option plan Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Options available for future grants Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Unrecognized compensation costs related to stock options granted Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted average period over which cost is expected to be recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Stock-based compensation expense Stock or Unit Option Plan Expense Stock-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition Cash received from stock option exercises Proceeds from Stock Options Exercised Per share weighted average fair value of the stock options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Shares granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Weighted average exercise price of share granted in period Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Valuation Allowance [Table] Valuation Allowance [Table] Valuation Allowance by Deferred Tax Asset [Axis] Valuation Allowance by Deferred Tax Asset [Axis] Deferred Tax Asset [Domain] Deferred Tax Asset [Domain] Valuation Allowance of Deferred Tax Assets [Member] Valuation Allowance of Deferred Tax Assets [Member] Valuation Allowance [Line Items] Valuation Allowance [Line Items] Document Fiscal Year Focus Document Fiscal Year Focus Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance, beginning of year Deferred Tax Assets, Valuation Allowance (Increase) in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Balance, end of year Significant Accounting Policies Significant Accounting Policies [Text Block] Options Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Shares under option, beginning of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Shares under option, end of period Excercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Exercise Price Range [Rollforward] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Roll Forward] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Rollforward] Stock Option Exercise Price Range, Shares under option, Lower Range Limit, Beginning Balance Share-based Compensation Arrangements by Share-based Payment Award, Options, Outstanding, Exercise Price, Lower Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Outstanding, Exercise Price, Lower Limit Stock Option Exercise Price Range, Shares under option, Upper Range Limit, Beginning Balance Share-based Compensation Arrangements by Share-based Payment Award, Options, Outstanding, Exercise Price, Upper Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Outstanding, Exercise Price, Upper Limit Stock Option Exercise Price Range, Granted, Lower Range Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Exercise Price, Lower Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Exercise Price, Lower Limit Stock Option Exercise Price Range, Granted, Upper Range Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Exercise Price, Upper Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Exercise Price, Upper Limit Stock Option Exercise Price Range, Exercised, Lower Range Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Exercise Price, Lower Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Exercise Price, Lower Limit Stock Option Exercise Price Range, Exercised, Upper Range Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Exercise Price, Upper Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Exercise Price, Upper Limit Stock Option Exercise Price Range, Expired, Lower Range Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Exercise Price, Lower Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Exercise Price, Lower Limit Stock Option Exercise Price Range, Expired, Upper Range Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Exercise Price, Upper Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Exercise Price, Upper Limit Stock Option Exercise Price Range, Forfeited, Lower Range Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Exercise Price, Lower Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Exercise Price, Lower Limit Stock Option Exercise Price Range, Forfeited, Upper Range Limit Share based Compensation Arrangements by Share based Payment Award Options Forfeitures in Period Exercise Price Upper Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Exercise Price, Upper Limit Stock Option Exercise Price Range, Shares under option, Lower Range Limit, Ending Balance Stock Option Exercise Price Range, Shares under option, Upper Range Limit, Ending Balance Stock option exercise price range, exercisable, lower range limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercisable, Exercise Price, Lower Limit SShare-based Compensation Arrangements by Share-based Payment Award, Options, Exercisable, Exercise Price, Lower Limit Stock option exercise price range, exercisable, upper range limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercisable, Exercise Price, Upper Limit Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercisable, Exercise Price, Upper Limit Weighted average exercise price [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Shares under option, Weighted Average Exercise Price, Beginning Balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted, Weighted Average Exercise Price Exercised, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Expired, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Forfeited, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Shares under option,Weighted Average Exercise Price, Ending Balance Exercisable, weighted average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted average remaining contractual life, shares under option Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Interest Expense [Abstract] Exercisable, weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate intrinsic value of in-the-money options, shares under option Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Exercisable, aggregate intrinsic value of in-the-money options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Consolidated Statements of Stockholders’ Equity [Abstract] Consolidated Statements of Stockholders’ Equity [Abstract] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Paid in Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Increase (decrease) in stockholders' equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Shares outstanding at period start (in shares) Shares, Outstanding Stockholders' equity at period start Net (loss) Shares outstanding at period end (in shares) Stockholders' equity at period end Total intrinsic value of stock options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercised, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercised, Intrinsic Value Total fair value of stock options vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Fair Value Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Product Warranty Obligations Product Warranty Disclosure [Text Block] Earnings Per Share, Basic and Diluted [Abstract] Weighted average number of shares outstanding Weighted Average Number of Shares Outstanding, Basic Common stock equivalents related to stock option grants that were included in the computation of the weighted-average number of shares outstanding Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Shares under option excluded as anti-dilutive Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Compensation - Options Granted, Exercised, Cancelled, or Available for Exercise Schedule of Share-based Compensation, Options Granted, Exercised, Cancelled, or Available for Exercise [Table Text Block] Schedule of Share-based Compensation, Options Granted, Exercised, Cancelled, or Available for Exercise [Table Text Block] Intrinsic Value and Cash Received from Stock Option Exercises and Fair Value of Vested Stock Options Intrinsic Value and Cash Received from Stock Option Exercises and Fair Value of Vested Stock Options [Table Text Block] Intrinsic Value and Cash Received from Stock Option Exercises and Fair Value of Vested Stock Options [Table Text Block] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment by Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Machinery and equipment Machinery and Equipment [Member] Furniture and office equipment Furniture and Fixtures [Member] Tooling Tools, Dies and Molds [Member] Display booths Display booths [Member] Display booths, used for trade shows Computer equipment Computer Equipment [Member] Leasehold improvements Leasehold Improvements [Member] Assets in progress Assets in Progress [Member] Assets in Progress - Fixed assets, i.e., tooling, equipment, begun but not yet completed/in service. [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Estimated useful life Property, Plant and Equipment, Useful Life Equipment and leasehold improvements, gross Property, Plant and Equipment, Gross Less: accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Equipment and leasehold improvements, net Company match, percentage Defined Contribution Plan, Company Match Defined Contribution Plan, Company Match Company contributions Defined Contribution Plan, Cost Income Per Common and Common Stock Equivalent Share Earnings Per Share [Text Block] Deferred Compensation Pension and Other Postretirement Benefits Disclosure [Text Block] Federal income tax (benefit) at statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State income tax (benefit), net of federal income tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Increase in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Stock-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount Adjustments for unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Remeasurement of deferred income taxes Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Other Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Total income tax provision Operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Adjustments to reconcile net (loss) income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] (Recovery of) provision for doubtful accounts Provision for Doubtful Accounts Loss on disposal of equipment and leasehold improvements Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Depreciation of equipment and leasehold improvements Depreciation, Depletion and Amortization Deferred income taxes Deferred Income Tax Expense (Benefit) Change in cash surrender value of life insurance Life Insurance, Corporate or Bank Owned, Change in Value Change in deferred compensation accrual Increase (Decrease) in Deferred Compensation Net changes in operating assets and liabilities (see note 14) Cash provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Investing activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Life insurance premiums paid Payment to Acquire Life Insurance Policy, Investing Activities Purchase of equipment and leasehold improvements Payments to Acquire Property, Plant, and Equipment Cash (used in) investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Financing activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Net increase (decrease) in cash and cash equivalents Net Cash Provided by (Used in) Continuing Operations Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Sales by Country Revenue from External Customers by Geographic Areas [Table Text Block] Employee Benefit Plans Compensation and Employee Benefit Plans [Text Block] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Deferred Deferred Federal, State and Local, Tax Expense (Benefit) Debt Disclosure [Abstract] Credit Facility Debt Disclosure [Text Block] Accrued Liabilities, Current [Abstract] Accrued Liabilities Other Liabilities Disclosure [Text Block] Equipment and Leasehold Improvements Property, Plant and Equipment Disclosure [Text Block] Inventory Disclosure [Abstract] Inventories Inventory Disclosure [Text Block] Deferred Income Tax Assets: Deferred Tax Assets, Net [Abstract] Deferred compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits Stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Accrued expenses and reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Federal and state net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Equipment and leasehold improvements Deferred Tax Assets, Property, Plant and Equipment Valuation allowance Other Deferred Tax Assets, Other Total deferred income tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred Income Tax Liabilities: Deferred Tax Liabilities, Gross [Abstract] Equipment and leasehold improvements Deferred Tax Liabilities, Property, Plant and Equipment Other Deferred Tax Liabilities, Other Net deferred income tax assets Receivables [Abstract] Amounts written-off Allowance for Doubtful Accounts Receivable, Write-offs Recoveries of previously written-off Allowance for Doubtful Accounts Receivable, Recoveries Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) Maximum amount Board will approve per repurchase Stock Repurchase Program, maximum amount Board will approve per repurchase The amount authorized by an entity's Board of Directors under a stock repurchase plan, per repurchase instance Authorized amount Stock Repurchase Program, Authorized Amount Inception to date repurchased Stock Repurchase Program, inception to date repurchased The total amount repurchased, inception to date, of stock for stock repurchase program Line of Credit Facility [Table] Line of Credit Facility [Table] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Prime Rate [Member] Prime Rate [Member] London Interbank Offered Rate (LIBOR) [Member] London Interbank Offered Rate (LIBOR) [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Document Period End Date Document Period End Date Line of Credit, Current Line of Credit, Current Revolving secured credit facility, maximum borrowing available Line of Credit Facility, Maximum Borrowing Capacity Interest rate, percentage spread, depending on Company's leverage ratio Debt Instrument, Basis Spread on Variable Rate Unused capacity, commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Line of credit sublimit Line of Credit Facility, Capacity Available for Trade Purchases Interest Expense Interest Expense, Debt Unauthorized Transaction Related Costs and Recoveries Unauthorized Transactions, Related Costs and Recoveries, net [Table Text Block] Unauthorized Transactions, Related Costs and Recoveries, net [Table Text Block] Legal Matters Legal Matters and Contingencies [Text Block] Term Operating leases, term Length in years of operating lease for building Annual lease commitment Operating leases, annual lease commitment Operating leases, annual lease commitment Rent expense Operating Leases, Rent Expense Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Basis of Consolidation Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Sales of Goods [Policy Text Block] Shipping and Handling Fees and Costs Shipping and Handling Cost, Policy [Policy Text Block] Research and Development Research and Development Expense, Policy [Policy Text Block] Advertising Costs Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] (Loss) Income Per Common and Common Stock Equivalent Share Earnings Per Share, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Accounts Receivable Trade and Other Accounts Receivable, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Equipment and Leasehold Improvements Property, Plant and Equipment, Policy [Policy Text Block] Life Insurance Policies Life Insurance Policies [Policy Text Block] Life Insurance Policies [Policy Text Block] Product Warranty Obligations Standard Product Warranty, Policy [Policy Text Block] Deferred Compensation Compensation Related Costs, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Legal Costs Legal Costs, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Reclassifications Comparability of Prior Year Financial Data, Policy [Policy Text Block] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Statement, Geographical [Axis] Geographical [Axis] Segment, Geographical [Domain] Geographical [Domain] United States UNITED STATES Non-U.S. Countries [Member] Non-U.S. Countries [Member] Non-U.S. Countries [Member] People's Republic of China CHINA Sweden SWEDEN Czech Republic CZECH REPUBLIC Malaysia MALAYSIA Russian Federation RUSSIAN FEDERATION Canada CANADA All other countries All other countries [Member] All other countries [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Change in the Allowance for Doubtful Accounts Change in the allowance for doubtful accounts [Table Text Block] Table detailing the change in the allowance for doubtful accounts balance [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation 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] Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block] Summary of Valuation Allowance Summary of Valuation Allowance [Table Text Block] Legal fees incurred Gain contingency, legal fees Legal fees charged to expense during the period, related to unauthorized transactions Gross proceeds from settlement of the third party lawsuit Gain contingency, gross proceeds from legal settlements Gross proceeds from legal settlements included in income for the period, related to unauthorized transactions Proceeds from asset forfeitures Gain contingency, proceeds from asset forfeitures Proceeds from former VP of Finance's assets forfeited included in income for the period, related to unauthorized transactions Unauthorized transaction related (recoveries) costs, net Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Internal Revenue Service (IRS) [Member] Internal Revenue Service (IRS) [Member] Wisconsin Department of Revenue [Member] Wisconsin Department of Revenue [Member] Designated tax department of the state of Wisconsin government entitled to levy and collect income taxes from the entity. State and Local Jurisdiction [Member] State and Local Jurisdiction [Member] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Operating Loss Carryforwards, Expiration Date Operating Loss Carryforwards, Expiration Date Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate LIFO reserve Inventory, LIFO Reserve Raw materials Inventory, Raw Materials, Gross Finished goods Inventory, Finished Goods, Gross Gross inventory Inventory, Gross Reserve for obsolete inventory Inventory Valuation Reserves Total inventories Trade accounts receivable, two largest customers, percentage Percent of gross accounts receivable with two largest customers Percent of gross accounts receivable with two largest customers Foreign trade accounts receivable, denominated in US dollars, percentage Foreign accounts receivable denominated in US dollars Foreign accounts receivable denominated in US dollars Schedule of Inventory, Current Schedule of Inventory, Current [Table Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entities [Table] Entities [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 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 Public Float Entity Public Float Cooperative advertising and promotion allowances Cooperative advertising and promotion allowances Short term (less than one year) liability accrued as of the balance sheet date for cooperative advertising with customers, allowances as a percentage of sales to be taken against future payments, volume rebate accruals to be paid out shortly after fiscal year end, and various promotion allowances including but not limited to programs such as inclusion of our product in a customer's print ads, opening of new stores of an established customer, and initial purchase with a new customer to stock their various locations. Product warranty obligations Product Warranty Accrual, Current Customer credit balances Customer Refund Liabilities, Current Carrying amount as of the balance sheet date of amounts received from and refundable to customers unless used by them to obtain goods and services from the entity, carried in Current Accrued Liabilities. Current deferred compensation Deferred Compensation Liability, Current Accrued returns Accrued Returns Current liability as of the balance sheet date for anticipated product returns from customers (retailers and distributors). Employee benefits Employee-related Liabilities, Current Legal and professional fees Accrued Professional Fees, Current Profit-sharing Accrued Bonuses, Current Sales commissions and bonuses Accrued Sales Commission, Current Other Other Liabilities, Current Total accrued liabilities Stock Options Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block]