Cover [Abstract] Document Type Document Type Document Annual Report Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Current Fiscal Year End Date Current Fiscal Year End Date Document Transition Report Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Address, Address Line One Entity Address, City or Town Entity Address, State or Province Entity Tax Identification Number Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Well Known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company ICFR Auditor Attestation Flag Entity Shell Company Entity Public Float Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Documents Incorporated by Reference [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Entity Central Index Key Entity Central Index Key Amendment Flag Amendment Flag Consolidated Balance Sheets [Abstract] Current assets: Cash and cash equivalents Cash and cash equivalents at end of year Cash and cash equivalents at beginning of year Accounts receivable, less allowance for doubtful accounts of $41,500 and $74,082, respectively Inventories Inventories, net Prepaid expenses and other current assets Income taxes receivable us-gaap_AssetsCurrent Total current assets Equipment and leasehold improvements, net Equipment and leasehold improvements, net Other assets: Operating lease right-of-use assets Cash surrender value of life insurance us-gaap_OtherAssetsNoncurrent Total other assets us-gaap_Assets Total assets Current liabilities: Accounts payable Accrued Liabilities, Current Accrued liabilities Total accrued liabilities us-gaap_ContractWithCustomerLiabilityCurrent Deferred revenue us-gaap_OperatingLeaseLiabilityCurrent Operating lease liability Taxes Payable, Current Income taxes payable Short-term Debt Short-term debt us-gaap_LiabilitiesCurrent Total current liabilities Long-term liabilities: Deferred compensation Deferred revenue Operating lease liability us-gaap_LiabilitiesNoncurrent Total long-term liabilities us-gaap_Liabilities Total liabilities Stockholders' equity: Common stock, $0.005 par value, authorized 20,000,000 shares; issued and outstanding 8,608,706 and 7,404,831 shares, respectively Paid in capital Retained earnings us-gaap_StockholdersEquity Balance Balance Total stockholders' equity us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders' equity Accounts receivable, allowance for doubtful accounts Common stock, par value (in dollars per share) Common stock, shares authorized (in shares) Common stock, shares issued (in shares) Common stock, shares outstanding (in shares) Balance (in shares) Balance (in shares) Consolidated Statements of Operations [Abstract] Net sales Net Sales Cost of goods sold us-gaap_GrossProfit Gross profit Selling, general and administrative expenses us-gaap_OperatingIncomeLoss (Loss) from operations Other Nonoperating Income (Expense) Other income Interest income us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments Income (loss) before income tax provision Income Tax Expense (Benefit) Income tax provision Total income tax provision (benefit) Net income (loss) Net (loss) income Net income (loss) Income (loss) per common share: us-gaap_EarningsPerShareBasic Basic (in dollars per share) Basic (in dollars per share) us-gaap_EarningsPerShareDiluted Diluted (in dollars per share) Diluted (in dollars per share) Weighted-average number of shares: Basic (in shares) Weighted average shares, basic (in shares) Diluted (in shares) Diluted shares (in shares) Consolidated Statements of Cash Flows [Abstract] Operating activities: Adjustments to reconcile net income (loss) to net cash provided by operating activities: (Recovery of) provision for doubtful accounts of accounts receivable Depreciation of equipment and leasehold improvements us-gaap_ShareBasedCompensation Stock-based compensation expense us-gaap_DeferredIncomeTaxExpenseBenefit Deferred income taxes us-gaap_LifeInsuranceCorporateOrBankOwnedChangeInValue Change in cash surrender value of life insurance Provision for deferred compensation Deferred Compensation Arrangement with Individual, Distribution Paid Deferred compensation paid Deferred compensation paid Other Noncash Income Other income - SBA loan forgiveness Net changes in operating assets and liabilities: us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable us-gaap_IncreaseDecreaseInInventories Inventories us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Prepaid expenses and other current assets us-gaap_IncreaseDecreaseInIncomeTaxesReceivable Income taxes receivable Increase (Decrease) in Income Taxes Payable Income taxes payable us-gaap_IncreaseDecreaseInAccountsPayable Accounts payable us-gaap_IncreaseDecreaseInAccruedLiabilities Accrued liabilities us-gaap_IncreaseDecreaseInContractWithCustomerLiability Deferred revenue us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Investing activities: us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchase of equipment and leasehold improvements us-gaap_PaymentsToAcquireLifeInsurancePolicies Life insurance premiums paid us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash (used in) investing activities Financing activities: Proceeds from Issuance of Long-term Debt Proceeds from SBA loan us-gaap_ProceedsFromStockOptionsExercised Proceeds from exercise of stock options Cash received from stock option exercises us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by financing activities us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease Net increase in cash and cash equivalents Consolidated Statements of Stockholders' Equity [Abstract] Statement [Table] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid In Capital [Member] Paid-in Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Statement [Line Items] Stock-based compensation expense, as restated Stock-based compensation expense Exercise of common stock options (in shares) Exercised, number of shares (in shares) Exercise of common stock options Significant Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Significant Accounting Policies New Accounting Pronouncements [Abstract] Accounting Standards Update and Change in Accounting Principle [Text Block] New Accounting Pronouncements Revenue Recognition [Abstract] Revenue from Contract with Customer [Text Block] Revenue Recognition Inventories [Abstract] Inventories [Text Block] Inventories Equipment and Leasehold Improvements [Abstract] Property, Plant and Equipment Disclosure [Text Block] Equipment and Leasehold Improvements Income Taxes [Abstract] Income Tax Disclosure [Text Block] Income Taxes Credit Facility and SBA Loan [Abstract] Debt Disclosure [Text Block] Credit Facility and SBA Loan Accrued Liabilities [Abstract] Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accrued Liabilities Deferred Compensation [Abstract] Compensation Related Costs, General [Text Block] Deferred Compensation Income (Loss) Per Common and Common Stock Equivalent Share [Abstract] Earnings Per Share [Text Block] Income (Loss) Per Common and Common Stock Equivalent Share Stock Options [Abstract] Share-based Payment Arrangement [Text Block] Stock Options Stock Repurchase Program [Abstract] Treasury Stock [Text Block] Stock Repurchase Program Leases [Abstract] Lessee, Operating Leases [Text Block] Leases Employee Benefit Plans [Abstract] Compensation and Employee Benefit Plans [Text Block] Employee Benefit Plans Concentrations [Abstract] Concentration Risk Disclosure [Text Block] Concentrations Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events Legal Matters [Abstract] Legal Matters and Contingencies [Text Block] Legal Matters Basis of Accounting, Policy [Policy Text Block] Nature of Business Consolidation, Policy [Policy Text Block] Basis of Consolidation Revenue from Contract with Customer [Policy Text Block] Revenue Recognition Research and Development Expense, Policy [Policy Text Block] Research and Development Advertising Cost [Policy Text Block] Advertising Costs Income Tax, Policy [Policy Text Block] Income Taxes Disclosure of accounting policy for patent costs. Patent Costs [Policy Text Block] Patent Costs Earnings Per Share, Policy [Policy Text Block] Income (Loss) Per Common And Common Stock Equivalent Share Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Accounts Receivable [Policy Text Block] Accounts Receivable Inventory, Policy [Policy Text Block] Inventories Property, Plant and Equipment, Policy [Policy Text Block] Equipment and Leasehold Improvements Lessee, Leases [Policy Text Block] Leases Life Insurance Policies [Policy Text Block] Life Insurance Policies [Policy Text Block] Life Insurance Policies Compensation Related Costs, Policy [Policy Text Block] Deferred Compensation Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Impairment of Long-Lived Assets Legal Costs, Policy [Policy Text Block] Legal Costs Share-based Payment Arrangement [Policy Text Block] Stock-Based Compensation Debt, Policy [Policy Text Block] Other Income Use of Estimates, Policy [Policy Text Block] Use of Estimates Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue Schedule of Inventory, Current [Table Text Block] Components of Inventories Property, Plant and Equipment [Table Text Block] Summary of Major Categories of Equipment and Leasehold Improvements Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Components of Income Tax (Benefit) Provision Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Effective Income Tax Rate Reconciliation Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Deferred Income Tax Assets and Liabilities Summary of Valuation Allowance [Table Text Block] Schedule of Change in Valuation Allowance Schedule of Accrued Liabilities [Table Text Block] Schedule of Accrued Liabilities Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] (Loss) Income Per Common and Common Stock Equivalent Share Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Stock Options, Assumptions Share-based Payment Arrangement, Option, Activity [Table Text Block] Stock Option Activity Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block] Intrinsic Value Schedule of Nonvested Share Activity [Table Text Block] Nonvested Option Activity Lease, Cost [Table Text Block] Lease Expense Lessee, Operating Lease, Liability, Maturity [Table Text Block] Future Minimum Lease Payments Operating Loss Carryforwards [Table] Debt Instrument [Axis] Debt Instrument Name [Domain] Debt Instrument, Name [Domain] SBA Loan [Member] Sba Loan [Member] SBA Loan [Member] Operating Loss Carryforwards [Line Items] Ownership Percentage Ownership Percentage Number Of Subsidiaries Number Of Subsidiaries Research and Development Expense Advertising Expense Impairment of Long-Lived Assets Held-for-use Debt Instrument, Decrease, Forgiveness Debt forgiven Revenue, Remaining Performance Obligation, Percentage Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Statistical Measurement [Axis] Range [Member] Statistical Measurement [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] us-gaap_ContractWithCustomerLiabilityRevenueRecognized Revenue recognized us-gaap_ContractWithCustomerLiability Deferred revenue liability Period in which remaining performance obligation is expected to be recognized as contract with customer liability, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days koss_ContractWithCustomerLiabilityRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod Contract with Customer, Liability, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year) Disaggregation of Revenue [Table] Geographical [Axis] Segment Geographical [Domain] Geographical [Domain] U [S] United States [Member] Non Us [Member] Export [Member] Disaggregation of Revenue [Line Items] Raw materials Finished goods us-gaap_InventoryGross Inventories, gross us-gaap_InventoryValuationReserves Reserve for obsolete inventory Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Property, Plant and Equipment, Useful Life Estimated useful lives (in years) Property, Plant and Equipment, Gross Property, plant and equipment, gross Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less: accumulated depreciation and amortization Income Tax Disclosure [Table] Income Tax Disclosure [Table] Income Tax Disclosure [Line Items] Income Tax Disclosure [Line Items] Amount of operating loss carryforwards that are subject to expiration dates. Operating Loss Carryforwards, Subjext to Expiration Operating loss carryforwards, subject to expiration Amount of operating loss carryforwards that are not subject to expiration dates. Operating Loss Carryforwards, Not Subject to Expiration Operating loss carryforwards, not subject to expiration Operating Loss Carryforwards Operating loss carryforwards Income Tax Examination, Penalties and Interest Expense Interest and penalties Unrecognized Tax Benefits Unrecognized tax benefits Current Federal Tax Expense (Benefit) Current: Federal Current State and Local Tax Expense (Benefit) Current: State Deferred Federal, State and Local, Tax Expense (Benefit) Deferred Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Federal income tax liability (benefit) at statutory rate Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount State income tax liability, net of federal income tax effect Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Increase in valuation allowance Effective Income Tax Rate Reconciliation, (Deduction) Addback, Employee Stock Ownership Plan Dividend, Amount Effective Income Tax Rate Reconciliation, (Deduction) Addback, Employee Stock Ownership Plan Dividend, Amount Stock option (deduction) addback Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount Non-deductible offier's compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount All other permanent items Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount R&D credit Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount Return-to-provision Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to adjustment to deferred tax assets. Effective Income Tax Rate Reconciliation, Adjustment To Deferred Tax Assets, Amount Expiration of stock options and tax credits Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount State tax rate change Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Other Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits Deferred compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Accrued expenses and reserves Deferred Tax Assets, Deferred Income Deferred revenue Deferred Tax Assets, Operating Loss Carryforwards Federal and state net operating loss carryforwards Deferred Tax Assets, Tax Credit Carryforwards Credit carryforwards Deferred Tax Assets, Property, Plant and Equipment Equipment and leasehold improvements Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Lease liability Deferred Tax Assets, Valuation Allowance Valuation allowance Balance, end of year Balance, beginning of year Deferred Tax Assets, Net of Valuation Allowance Total deferred income tax assets Deferred Tax Liabilities, Leasing Arrangements ROU asset Deferred Tax Liabilities, Other Other Deferred Tax Assets, Net Net deferred income tax assets Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Decrease (Increase) in valuation allowance Line of Credit Facility [Table] Lender Name [Axis] Line Of Credit Facility Lender [Domain] Line of Credit Facility, Lender [Domain] Represents Town Bank. Town Bank [Member] Town Bank [Member] Represents the "Credit Agreement". Credit Agreement [Member] Credit Agreement [Member] Amended Credit Agreement [Member] Amended Credit Agreement [Member] Amended Credit Agreement [Member] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] London Interbank Offered Rate L I B O R [Member] London Interbank Offered Rate (LIBOR) [Member] Line of Credit Facility [Line Items] us-gaap_DebtInstrumentTerm Debt Instrument, Term (Year) Debt Instrument, Face Amount Principal amount us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage us-gaap_LineOfCredit Long-term Line of Credit, Total Interest Expense, Debt 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. Cooperative Advertising And Promotion Allowances Cooperative advertising and promotion allowances Customer Refund Liability, Current Customer credit balances Deferred Compensation Liability, Current Current deferred compensation Accrued Employee Benefits, Current Employee benefits Accrued Professional Fees, Current Legal and professional fees Accrued Bonuses, Current Bonus and profit-sharing Accrued Sales Commission, Current Sales commissions and bonuses Other Accrued Liabilities, Current Other 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, Excluding Share-based Payments and Postretirement Benefits [Line Items] Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Discount factor Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Life Expectancy Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Life Expectancy Life expectancy Deferred Compensation Arrangement with Individual, Recorded Liability Deferred compensation recorded liability Deferred Compensation Arrangement with Individual, Compensation Expense Deferred compensation expense Deferred Compensation Arrangement with Individual, Cash Compensation, Percentage Of Base Salary Deferred Compensation Arrangement with Individual, Cash Compensation, Percentage Of Base Salary Cash compensation, percentage of base salary us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements Dilutive effect of stock compensation awards (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Anti-dilutive shares Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Represents the 2012 omnibus incentive plan ("the Plan"). The2012 Omnibus Incentive Plan [Member] The 2012 Omnibus Incentive Plan [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1 Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) us-gaap_StockOptionPlanExpense Stock or Unit Option Plan Expense us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) Granted, weighted average grant date fair value (in dollars per share) Expected stock price volatility Risk free interest rate Expected life of options (Year) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Shares under option, number of shares (in shares) Shares under option, number of shares (in shares) Granted, number of shares (in shares) Granted (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod Expired, number of shares (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod Forfeited, number of shares (in shares) Exercisable, number of shares (in shares) Share-based Compensation Arrangements by Share-based Payment Award, Options, Outstanding, Exercise Price, Lower Limit Shares under option, stock options price range, lower limit (in dollars per share) Shares under option, stock options price range, lower limit (in dollars per share) Shares under option, stock options price range, lower limit (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Outstanding, Exercise Price, Upper Limit Shares under option, stock options price range, upper limit (in dollars per share) Shares under option, stock options price range, upper limit (in dollars per share) Shares under option, stock options price range, upper limit (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Exercise Price, Lower Limit Granted, stock options price range, lower limit (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Exercise Price, Upper Limit Granted, stock options price range, upper limit (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Exercise Price, Lower Limit Exercised, stock options price range, lower limit (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Exercise Price, Upper Limit Exercised, stock options price range, upper limit (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Exercise Price, Lower Limit Expired, stock options price range, lower limit (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Exercise Price, Upper Limit Expired, stock options price range, upper limit (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Exercise Price, Lower Limit Forfeited, stock options price range, lower limit (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Exercise Price, Upper Limit Forfeited, stock options price range, upper limit (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercisable, Exercise Price, Lower Limit Exercisable, stock options price range, lower limit (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercisable, Exercise Price, Upper Limit Exercisable, stock options price range, upper limit (in dollars per share) Shares under option, weighted average exercise price (in dollars per share) Shares under option, weighted average exercise price (in dollars per share) Shares under option, weighted average exercise price (in dollars per share) Granted, weighted average exercise price (in dollars per share) Exercised, weighted average exercise price (in dollars per share) Expired, weighted average exercise price (in dollars per share) Forfeited, weighted average exercise price (in dollars per share) Exercisable, weighted average exercise price (in dollars per share) Shares under option, weighted average remaining contractual life (Year) Exercisable, weighted average remaining contractual life (Year) Shares under option, aggregate intrinsic value of in-the-money options Exercisable, aggregate intrinsic value of in-the-money options Total intrinsic value of stock options exercised Total fair value of stock options vested Total recognized tax benefit us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares Non-vested (in shares) Non-vested (in shares) us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares Vested (in shares) us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares Forfeited (in shares) us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue Non-vested, weighted average grant date fair value (in dollars per share) Non-vested, weighted average grant date fair value (in dollars per share) us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue Vested, weighted average grant date fair value (in dollars per share) us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue Forfeited, weighted average grant date fair value (in dollars per share) Note To Financial Statement Details Textual Class of Treasury Stock [Table] Equity, Class of Treasury Stock [Line Items] us-gaap_StockRepurchaseProgramAuthorizedAmount1 Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Additional Authorized Amount Stock Repurchase Program, Additional Authorized Amount us-gaap_StockRepurchasedAndRetiredDuringPeriodShares Stock Repurchased and Retired During Period, Shares (in shares) Represents the percentage of fair value of common stock for repurchase price. koss_TreasuryStockRepurchasePricePercentageOfFairValueOfCommonStock Treasury Stock, Repurchase Price, Percentage of Fair Value of Common Stock Represents the limitation of amount to provide proceeds for stock purchase program. koss_StockRepurchaseProgramAmountToProvideProceedsLimitation Stock Repurchase Program, Amount to Provide Proceeds Limitation Represents the percentage of promissory note due. koss_PercentageOfPromissoryNoteDue Percentage of Promissory Note Due To Execute A Term of promissory note if contingency is chosen. koss_ContingentPromissoryNoteTerm Contingent Promissory Note Term (Year) Life Insurance, Corporate or Bank Owned, Amount Life insurance policies The amount of lease extension per year. koss_LeaseExtensionPerYear Lease Extension Per Year us-gaap_LesseeOperatingLeaseRenewalTerm Lessee, Operating Lease, Renewal Term (Year) Operating lease cost us-gaap_OperatingLeasePayments Operating cash flows from operating leases Weighted-average remaining lease term (in years) Weighted-average discount rate Lessee, Operating Lease, Liability, to be Paid, Year One 2022 us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo 2023 us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree 2024 2026 2025 us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive 2026 us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive Thereafter us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total lease payments us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Present value adjustment us-gaap_OperatingLeaseLiability Total lease liabilities Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP Cash contributions Defined Contribution Plan, Employer Matching Contribution, Percent of Match Matching contributions, percent Defined Contribution Plan, Cost Company contributions Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Manufacturing costs serves as benchmark in concentration of risk calculation. Manufacturing Costs Benchmark [Member] Manufacturing Costs Benchmark [Member] Concentration Risk [Line Items] Represents the number of major vendors. koss_NumberOfMajorVendors Number of Major Vendors us-gaap_ConcentrationRiskPercentage1 Concentration Risk, Percentage Loss Contingencies [Table] Loss Contingencies [Line Items] Gain (Loss) Related to Litigation Settlement Recovered fees and costs Loss Contingency, Estimate of Possible Loss Estimate of loss Loss Contingency Accrual Accrual Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Koss Corp B.V. [Member] Koss Corp B.v. [Member] Koss Corp B.V. [Member] Koss UK [Member] Koss Uk [Member] Koss UK [Member] Title of Individual [Axis] Title Of Individual With Relationship To Entity [Domain] Title of Individual [Domain] Director [Member] Director [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Long-Lived Tangible Asset [Axis] Property Plant And Equipment Type [Domain] Long-Lived Tangible Asset [Domain] Machinery And Equipment [Member] Machinery and Equipment [Member] Furniture And Fixtures [Member] Furniture and Office Equipment [Member] Tooling [Member] Tooling [Member] Tooling [Member] Computer Equipment [Member] Computer & Technology Equipment [Member] Leasehold Improvements [Member] Leasehold Improvements [Member] Asset Under Construction [Member] Assets in Progress [Member] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Domestic Country [Member] Federal [Member] State And Local Jurisdiction [Member] State and Local Jurisdiction [Member] Income Tax Authority, Name [Axis] Income Tax Authority Name [Domain] Income Tax Authority, Name [Domain] Wisconsin Department of Revenue [Member] Wisconsin Department Of Revenue [Member] Wisconsin Department of Revenue [Member] Other States [Member] Other States [Member] Other States [Member] Prime Rate [Member] Prime Rate [Member] Former Officer [Member] Former Officer [Member] Former Officer [Member] Officer [Member] Officer [Member] Chairman [Member] Chairman [Member] Chairman [Member] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Stock Repurchase Program [Member] Stock Repurchase Program [Member] 1995 Stock Repurchase Program [Member] Stock Repurchase Program B [Member] Stock Repurchase Program B [Member] 2021 Stock Repurchase Program B [Member] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Geographic Concentration Risk [Member] Geographic Concentration Risk [Member] Trade Accounts Receivable [Member] Trade Accounts Receivable [Member] Accounts Receivable [Member] Accounts Receivable [Member] Sales Revenue Net [Member] Revenue Benchmark [Member] Customer [Axis] Name Of Major Customer [Domain] Customer [Domain] Ingram Micro [Member] Ingram Micro [Member] Ingram Micro [Member] Wal-Mart [Member] Wal Mart [Member] Wal-Mart [Member] Amazon [Member] Amazon [Member] Amazon [Member] Five Largest Clients [Member] Five Largest Clients [Member] Five Largest Clients [Member] Foreign [Member] Foreign [Member] Foreign [Member] C [N] China [Member]