SEGMENT INFORMATION (Summary of Segment Information) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025	Jun. 30, 2025
Segment Reporting Information [Line Items]
Net sales	$ 2,824,763	$ 2,781,006	$ 9,756,920	$ 9,539,960
Cost of goods sold	1,822,002	1,696,334	6,294,661	5,877,405
Selling, general and administrative expenses	1,721,892	1,603,678	5,242,008	4,960,478
Net loss	(546,587)	(316,742)	(868,265)	(642,135)
Cash and cash equivalents	1,901,466		1,901,466		$ 2,807,797
Available-for-sale investments	16,956,081		16,956,081
Short term investments, held-to-maturity					12,879,882
Inventories	4,760,003		4,760,003		4,885,067
Long term investments, held-to-maturity					4,000,774
Total segment assets	36,058,652		36,058,652		37,184,609
Headphones and Related Accessories [Member]
Segment Reporting Information [Line Items]
Net sales	2,824,763	2,781,006	9,756,920	9,539,960
Cost of goods sold	$ 1,822,002	$ 1,696,334	$ 6,294,661	$ 5,877,405
Gross profit margin	35.50%	39.00%	35.50%	38.40%
New product certification and compliance testing	$ 31,075	$ 91,997	$ 50,326	$ 182,967
Legal and professional expense	257,269	201,833	904,642	759,135
Deferred compensation expense (income)	(603)	14,016	219,646	148,681
Other selling general and administrative expenses	1,434,151	1,295,832	4,067,394	3,869,695
Selling, general and administrative expenses	1,721,892	1,603,678	5,242,008	4,960,478
Net loss	(546,587)	$ (316,742)	(868,265)	$ (642,135)
Cash and cash equivalents	1,901,466		1,901,466		2,807,797
Available-for-sale investments	16,956,081		16,956,081
Short term investments, held-to-maturity					12,879,882
Inventories	4,760,003		4,760,003		4,885,067
Long term investments, held-to-maturity					4,000,774
Total segment assets	$ 36,058,652		$ 36,058,652		$ 37,184,609