Document Information Statement - USD ($)	12 Months Ended
	Jun. 30, 2021	Aug. 16, 2021	Dec. 31, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--06-30
Document Transition Report	false
Entity File Number	0-3295
Entity Registrant Name	KOSS CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	4129 North Port Washington Avenue
Entity Address, City or Town	Milwaukee
Entity Address, State or Province	WI
Entity Tax Identification Number	39-1168275
Entity Address, Postal Zip Code	53212
City Area Code	414
Local Phone Number	964-5000
Title of 12(b) Security	Common Stock, $0.005 par value per share
Trading Symbol	KOSS
Security Exchange Name	NASDAQ
Entity Well Known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 15,072,897
Entity Common Stock, Shares Outstanding		8,673,706
Documents Incorporated by Reference [Text Block]	Part III of this Form 10-K incorporates by reference certain information from Koss Corporation’s Proxy Statement for its 2021 Annual Meeting of Stockholders to be filed with the Commission under Regulation 14A within 120 days of the end of the fiscal year covered by this Form 10-K.
Document Fiscal Period Focus	FY
Entity Central Index Key	0000056701
Amendment Flag	false