Condensed Statements Of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statements of Comprehensive Loss [Abstract]
Net sales	$ 2,045	$ 2,135
Cost of goods sold	1,023	969
Gross profit	1,022	1,166
Operating expenses
Selling and marketing	370	446
General and administrative	522	503
Research and development	268	231
Total operating expenses	1,160	1,180
Operating loss	(138)	(14)
Non-operating income
Interest income	93	1
Total non-operating income, net	93	1
Loss before income tax benefit	(45)	(13)
Income tax benefit	(1)	(4)
Net loss	(44)	(9)
Other comprehensive loss
Change in unrealized value of available-for-sale securities, net of income tax	(4)	0
Other comprehensive loss	(4)	0
Net comprehensive loss	$ (48)	$ (9)
Basic
Net loss per share	$ (0.01)	$ 0
Weighted average shares	3,428,021	3,395,521
Diluted
Net loss per share	$ (0.01)	$ 0
Weighted average shares	3,428,021	3,395,521