CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net sales	$ 14,892	$ 11,938
Cost of sales	9,742	8,280
Gross profit	5,150	3,658
Operating expenses:
Selling expenses	48	25
General and administrative expenses	1,246	995
Research and development costs	843	805
Total operating expenses	2,137	1,825
Operating income	3,013	1,833
Other income (expense):
Interest and dividend income	25	24
Unrealized gain (loss) on investments	433	(2,553)
Interest expense	(152)	(133)
Total other income (loss)	306	(2,662)
Income (loss) before income taxes	3,319	(829)
Provision for income taxes	853	(214)
Net income (loss)	$ 2,466	$ (615)
Basic and diluted net income per share:
Basic net income (loss) per share	$ 0.76	$ (0.17)
Diluted net income (loss) per share	$ 0.75	$ (0.17)
Weighted-average common shares outstanding:
Basic	3,259,742	3,546,737
Diluted	3,292,142	3,546,737
Common shares outstanding	3,297,510	3,547,330