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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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