UNAUTHORIZED TRANSACTION RELATED COSTS AND RECOVERIES UNAUTHORIZED TRANSACTION RELATED COSTS AND RECOVERIES (Details) - USD ($)	3 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Unauthorized Transaction Related Costs and Recoveries [Abstract]
Legal fees incurred	$ 32,500	$ 0
Proceeds from asset forfeitures	(1,646)	(14,409)
Unauthorized transaction related costs (recoveries), net	$ 30,854	$ (14,409)

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.

No definition available.

Name:	koss_UnauthorizedTransactionRelatedCostsRecoveriesNet
Namespace Prefix:	koss_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration