Condensed Statements Of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statements of Comprehensive Loss [Abstract]
Net sales	$ 2,135	$ 1,901
Cost of goods sold	969	911
Gross profit	1,166	990
Operating expenses
Selling and marketing	446	348
General and administrative	503	443
Research and development	231	203
Total operating expenses	1,180	994
Operating loss	(14)	(4)
Non-operating income
Interest income	1	2
Total non-operating income, net	1	2
Loss before income tax benefit	(13)	(2)
Income tax benefit	(4)	0
Net loss	(9)	(2)
Other comprehensive loss
Change in unrealized value of available-for-sale securities, net of income tax	0	0
Other comprehensive loss	0	0
Net comprehensive loss	$ (9)	$ (2)
Basic
Net loss per share	$ 0	$ 0
Weighted average shares	3,395,521	3,395,521
Diluted
Net loss per share	$ 0	$ 0
Weighted average shares	3,395,521	3,395,521