UNAUTHORIZED TRANSACTION RELATED COSTS AND RECOVERIES, NARRATIVE (Details) (USD $)	12 Months Ended
Jun. 30, 2012
Unauthorized Transactions, Related Costs and Recoveries [Abstract]
Unauthorized transactions total, approximate, FY2005 through December 2009	$ 31,500,000

Unauthorized transactions total, approximate, FY2005 through December 2009

No definition available.

Name:	koss_UnauthorizedTransactionsTotalApproximateFy2005ThroughDecember2009
Namespace Prefix:	koss_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration