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Significant Accounting Policies (Narrative I) (Details)		12 Months Ended
	Nov. 03, 2020 USD ($)	Jun. 30, 2021 USD ($) item	Jun. 30, 2020 USD ($)
Operating Loss Carryforwards [Line Items]
Number Of Subsidiaries | item		2
Research and Development Expense		$ 410,602	$ 397,360
Advertising Expense		33,976	54,592
Impairment of Long-Lived Assets Held-for-use		0	$ 0
Other income		885,505
Director [Member]
Operating Loss Carryforwards [Line Items]
Other income		$ 378,805
Koss Corp B.V. [Member]
Operating Loss Carryforwards [Line Items]
Ownership Percentage		100.00%
Koss UK [Member]
Operating Loss Carryforwards [Line Items]
Ownership Percentage		100.00%
SBA Loan [Member]
Operating Loss Carryforwards [Line Items]
Debt forgiven	$ 506,700

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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