v3.26.1
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
12 Months Ended
Jun. 30, 2026
USD ($)
item
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Accounting Policies Disclosure [Line Items]      
Number of subsidiaries | item 2    
Accrued liabilities $ 1,007,487 $ 582,140  
Deferred revenue 241,432 242,644  
Research and development expense 229,736 213,870  
Advertising expense 296,549 251,966  
Allowance for credit losses 2,043 2,043 $ 1,922
Provision for credit losses 0 121  
Accounts receivable, allowance for credit loss, write-offs 0 0  
Accounts receivable, allowance for credit loss, recoveries 0 0  
Accounts receivable, net 1,221,760 1,135,672 $ 1,208,319
Allowance for credit losses, held-to-maturity debt securities 0    
Income taxes receivable 491,677    
Impairments of long-lived assets 0 0  
Debt securities sold amount 0    
Debt Securities, sold, realized gain (loss) 0    
Current Officer [Member]      
Accounting Policies Disclosure [Line Items]      
Deferred compensation expense (income) $ 235,831 $ 133,330  
Discount factor 5.67% 5.81%  
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%