Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 8,017	$ 7,559	$ 19,920	$ 17,810
Costs and expenses:
Cost of sales	4,345	3,840	11,280	9,150
Selling, general and administrative	3,273	2,801	9,201	8,858
Research and development	207	340	716	1,070
Costs and Expenses, Total	7,825	6,981	21,197	19,078
Operating income (loss)	192	578	(1,277)	(1,268)
Interest expense	(4)	(5)	(13)	(14)
Interest income	92	1	101	4
Other income, net	34	104	158	1,586
Income (loss) before income taxes	314	678	(1,031)	308
Income tax expense	0	0	(9)	(10)
Net income (loss)	$ 314	$ 678	$ (1,040)	$ 298
Net income (loss) per common share:
Basic net income (loss) per common share (in dollars per share)	$ 0.01	$ 0.02	$ (0.03)	$ 0.01
Diluted net income (loss) per common share (in dollars per share)	$ 0.01	$ 0.02	$ (0.03)	$ 0.01
Weighted-average number of common shares outstanding:
Basic (in shares)	30,296,000	30,264,000	30,287,000	29,356,000
Diluted (in shares)	30,371,000	30,335,000	30,287,000	29,482,000