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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) | 12 Months Ended |
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Jun. 30, 2025 USD ($) item | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($)
Accounting Policies Disclosure [Line Items] |  |  |
Number of subsidiaries | item | 2 |  |
Accrued liabilities | $ 582,140 | $ 462,858 |
Deferred revenue | 242,644 | 229,384 |
Research and development expense | 213,870 | 238,086 |
Advertising expense | 251,966 | 142,859 |
Allowance for credit losses | 2,043 | 1,922 | $ 6,027
Provision for (recovery of) credit losses | 121 | (4,105) |
Accounts receivable, allowance for credit loss, write-offs | 0 | 0 |
Accounts receivable, allowance for credit loss, recoveries | 0 | 0 |
Accounts receivable, net | 1,135,672 | 1,208,319 | $ 1,379,517
Allowance for credit losses, held-to-maturity debt securities | 0 |  |
Income taxes receivable | 491,677 | 722,498 |
Impairments of long-lived assets | $ 0 | 0 |
Adjustment [Member] |  |  |
Accounting Policies Disclosure [Line Items] |  |  |
Accrued liabilities |  | 60,511 |
Deferred revenue |  | $ (60,511) |
Koss UK [Member] |  |  |
Accounting Policies Disclosure [Line Items] |  |  |
Ownership percentage | 100.00% |  |
Koss Corp B.V. [Member] |  |  |
Accounting Policies Disclosure [Line Items] |  |  |
Ownership percentage | 100.00% |  |

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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