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EMPLOYEE BENEFIT PLANS, KOSS EMPLOYEE STOCK OWNERSHIP TRUST (KESOT) (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Retirement Benefits [Abstract] |  |
Koss Employee Stock Ownership Trust (KESOT), cash contributions | $ 0 | $ 0

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

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- Definition This item represents the amount of cash contributions during the period made by the entity to the Employee Stock Ownership Plan (ESOP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration