CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Net sales	$ 16,793	$ 12,588	$ 31,686	$ 24,526
Cost of sales	11,721	9,786	21,464	18,066
Gross profit	5,072	2,802	10,222	6,460
Operating expenses:
Selling expenses	49	37	98	63
General and administrative expenses	1,389	1,200	2,635	2,195
Research and development costs	942	788	1,784	1,593
Total operating expenses	2,380	2,025	4,517	3,851
Operating income	2,692	777	5,705	2,609
Interest expense	(204)	(139)	(357)	(271)
Unrealized gain (loss) on marketable equity investments	77	(40)	510	(2,593)
Interest and other income	21	22	46	46
Income (loss) before income taxes	2,586	620	5,904	(209)
Income tax benefit (expense)	(546)	(120)	(1,398)	94
Net income (loss)	$ 2,040	$ 500	$ 4,506	$ (115)
Basic net income (loss) per share
Net income (loss) per share	$ 0.63	$ 0.14	$ 1.36	$ (0.03)
Diluted net income (loss) per share:
Net income (loss) per share	$ 0.61	$ 0.14	$ 1.33	$ (0.03)
Weighted-average common shares outstanding:
Basic	3,261,145	3,546,901	3,314,207	3,546,819
Diluted	3,337,337	3,611,701	3,378,862	3,546,819
Common shares outstanding	3,260,390	3,541,045	3,260,390	3,541,045