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SEGMENT INFORMATION (Summary of Segment Information) (Details) - USD ($)
 3 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Segment Reporting Information [Line Items]      
Net sales $ 4,070,778 $ 3,201,868  
Cost of goods sold 2,442,086 2,028,942  
Selling, general and administrative expenses 1,674,732 1,810,059  
Net income (loss) 243,729 (419,535)  
Cash and cash equivalents 2,515,913   $ 2,807,797
Short term investments 13,942,994   12,879,882
Long term investments 4,000,985   4,000,774
Inventories 4,647,319   4,885,067
Total segment assets 37,663,395   37,184,609
Headphones and Related Accessories [Member]      
Segment Reporting Information [Line Items]      
Net sales 4,070,778 3,201,868  
Cost of goods sold $ 2,442,086 $ 2,028,942  
Gross profit margin 40.00% 36.60%  
New product certification and compliance testing $ 13,032 $ 87,741  
Legal and professional fees 229,134 283,891  
Deferred compensation expense 160,884 197,374  
Other selling general and administrative expenses 1,271,682 1,241,053  
Selling, general and administrative expenses 1,674,732 1,810,059  
Net income (loss) 243,729 $ (419,535)  
Cash and cash equivalents 2,515,913   2,807,797
Short term investments 13,942,994   12,879,882
Long term investments 4,000,985   4,000,774
Inventories 4,647,319   4,885,067
Total segment assets $ 37,663,395   $ 37,184,609