Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statements Of Comprehensive Income [Abstract]
Net sales	$ 9,029	$ 8,607
Cost of goods sold	4,188	3,930
Gross profit	4,841	4,677
Operating expenses
Selling and marketing	1,516	1,373
General and administrative	2,526	1,987
Research and development	836	876
Total operating expenses	4,878	4,236
Operating income (loss)	(37)	441
Non-operating income
Interest expense	(1)	(1)
Interest income	110	5
Other income	0	14
Total non-operating income, net	109	18
Income before income taxes	72	459
Income tax expense (benefit)	(28)	49
Net income	100	410
Other comprehensive income (loss)
Change in unrealized value of available-for-sale securities, net of income tax	1	(1)
Other comprehensive income (loss)	1	(1)
Net comprehensive income	$ 101	$ 409
Basic
Net income per share	$ 0.03	$ 0.12
Weighted average shares	3,401,137	3,395,521
Diluted
Net income per share	$ 0.03	$ 0.12
Weighted average shares	3,432,843	3,444,939