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ACCOUNTS RECEIVABLE, NARRATIVE (Details) | Jun. 30, 2018 Rate | Jun. 30, 2017 Rate
--- | --- | ---
Receivables [Abstract] |  |
Trade accounts receivable, two largest customers, percentage | 34.00% | 31.00%
Foreign trade accounts receivable, denominated in US dollars, percentage | 26.00% | 15.00%

X
- Definition Foreign accounts receivable denominated in US dollars + References No definition available. + Details
Name: | koss_ForeignaccountsreceivabledenominatedinUSdollars
Namespace Prefix: | koss_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Percent of gross accounts receivable with two largest customers + References No definition available. + Details
Name: | koss_PercentOfGrossAccountsReceivableWithTwoLargestCustomers
Namespace Prefix: | koss_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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