CONSOLIDATED BALANCE SHEETS - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2022
Current assets:
Cash and cash equivalents	$ 796,100	$ 1,927,100	$ 2,971,100
Investment securities	4,928,700	4,272,100	6,391,600
Trade accounts receivable, less allowance for doubtful accounts of $15,600, $33,600 and $15,600 at December 31, 2023 and 2022 and June 30, 2022	1,157,100	1,312,900	1,501,400
Inventories	4,883,900	4,859,600	4,696,300
Income tax receivable	161,400	161,400	161,100
Prepaid expenses and other current assets	413,500	456,800	547,600
Assets of discontinued operations	0	0	200
Total current assets	12,340,700	12,989,900	16,269,300
Property and equipment, net	1,082,300	1,163,200	1,005,600
Goodwill	115,300	115,300	115,300
Other intangible assets, net	1,249,900	1,763,000	2,079,800
Inventories- noncurrent	609,000	606,000	0
Operating lease right-of-use assets	1,273,900	1,373,600	1,475,500
Other assets	59,400	58,200	62,400
Total assets	16,730,500	18,069,200	21,007,900
Current liabilities:
Accounts payable	711,700	887,300	1,105,900
Accrued expenses	777,900	821,800	796,000
Contract liabilities	23,600	134,400	29,000
Lease liabilities, current portion	324,100	276,900	299,300
Total current liabilities	1,837,300	2,120,400	2,230,200
Lease liabilities, less current portion	1,007,800	1,156,200	1,239,600
Total liabilities	2,845,100	3,276,600	3,469,800
Shareholders' equity:
Common stock, $.05 par value; 30,000,000, 20,000,000 and 20,000,000 shares authorized; 10,145,211, 7,023,401 and 7,023,401 shares issued; 10,145,211, 7,003,599 and 7,003,599 shares outstanding at December 31, 2023 and 2022 and June 30, 2022	507,300	351,200	351,200
Additional paid-in capital	40,844,600	32,900,800	31,664,100
Accumulated comprehensive income (loss)	18,600	(8,400)	(105,600)
Accumulated deficit	(27,485,100)	(18,398,600)	(14,319,200)
Stockholders' Equity before Treasury Stock	13,885,400	14,845,000	17,590,500
Less common stock held in treasury at cost, 0, 19,802 and 19,802 shares at December 31, 2023 and 2022 and June 30, 2022	0	52,400	52,400
Total shareholders' equity	13,885,400	14,792,600	17,538,100
Total liabilities and shareholders' equity	$ 16,730,500	$ 18,069,200	$ 21,007,900