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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
 12 Months Ended
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%