CONSOLIDATED INCOME STATEMENTS - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Net sales	$ 53,844	$ 46,087
Cost of sales	39,293	33,338
Gross profit	14,551	12,749
Operating expenses:
Selling expenses	117	155
General and administrative expenses	4,072	4,028
Research and development costs	3,189	2,804
Total operating expenses	7,378	6,987
Operating income	7,173	5,762
Other income (expense):
Interest and dividend income	144	294
Unrealized gain (loss) on marketable equity investments	(4,125)	3,899
Gain on sale of investments	0	6
Interest expense	(558)	(533)
Total other income (expense)	(4,539)	3,666
Income before income taxes	2,634	9,428
Income tax expense	507	2,354
Net income	$ 2,127	$ 7,074
Basic & Diluted income per share:
Basic net income per share	$ 0.61	$ 1.98
Diluted net income per share	$ 0.60	$ 1.95
Weighted-average common shares outstanding:
Basic	3,498,807	3,571,044
Diluted	3,571,207	3,636,944