Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Statements Of Comprehensive Income [Abstract]
Net sales	$ 9,373	$ 8,555
Cost of goods sold	4,791	4,310
Gross profit	4,582	4,245
Operating expenses
Selling and marketing	1,441	1,332
General and administrative	2,132	1,968
Research and development	1,013	973
Total operating expenses	4,586	4,273
Operating loss	(4)	(28)
Non-operating income (expense)
Interest expense	0	(1)
Interest income	440	407
Total non-operating income, net	440	406
Income before income taxes	436	378
Income tax expense (benefit)	(10)	103
Net income	446	275
Other comprehensive loss
Change in unrealized value of available-for-sale securities, net of income tax	0	(1)
Other comprehensive loss	0	(1)
Net comprehensive income	$ 446	$ 274
Basic
Net income per share	$ 0.13	$ 0.08
Weighted average shares	3,435,040	3,428,021
Diluted
Net income per share	$ 0.13	$ 0.08
Weighted average shares	3,435,040	3,428,021