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Leases (Narrative) (Details) | 12 Months Ended
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Jun. 30, 2021 USD ($)
Note To Financial Statement Details Textual |
Lease Extension Per Year | $ 380,000
Lessee, Operating Lease, Renewal Term (Year) | 5 years

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- Definition The amount of lease extension per year. + References No definition available. + Details
Name: | koss_LeaseExtensionPerYear
Namespace Prefix: | koss_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | koss_NoteToFinancialStatementDetailsTextual
Namespace Prefix: | koss_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant