Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues	$ 27,081	$ 26,941
Costs and expenses:
Cost of sales	15,425	15,298
Selling, general and administrative	12,803	12,275
Research and development	1,511	895
Total costs and expenses	29,739	28,468
Operating loss	(2,658)	(1,527)
Interest expense	(21)	(17)
Interest income	1,300	202
Other expense, net	(90)	(46)
Loss before income taxes	(1,469)	(1,388)
Income tax expense	(69)	(54)
Net loss	$ (1,538)	$ (1,442)
Net loss per common share:
Basic net loss per common share (in dollars per share)	$ (0.05)	$ (0.05)
Diluted net loss per common share (in dollars per share)	$ (0.05)	$ (0.05)
Weighted-average number of common shares outstanding:
Basic weighted-average shares (in shares)	30,348,000	30,289,000
Diluted (in shares)	30,348,000	30,289,000