Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues	$ 7,988	$ 8,017	$ 20,736	$ 19,920
Costs and expenses:
Cost of sales	4,376	4,345	12,323	11,280
Selling, general and administrative	2,966	3,273	9,126	9,201
Research and development	513	207	1,144	716
Costs and Expenses	7,855	7,825	22,593	21,197
Operating income (loss)	133	192	(1,857)	(1,277)
Interest expense	(5)	(4)	(15)	(13)
Interest income	322	92	968	101
Other income (expense), net	9	34	(95)	158
Income (loss) before income taxes	459	314	(999)	(1,031)
Income tax expense	0	0	0	(9)
Net income (loss)	$ 459	$ 314	$ (999)	$ (1,040)
Net income (loss) per common share:
Basic net income (loss) per common share (in dollars per share)	$ 0.02	$ 0.01	$ (0.03)	$ (0.03)
Diluted net income (loss) per common share (in dollars per share)	$ 0.01	$ 0.01	$ (0.03)	$ (0.03)
Weighted-average number of common shares outstanding:
Basic (in shares)	30,385,000	30,296,000	30,336,000	30,287,000
Diluted (in shares)	30,627,000	30,371,000	30,336,000	30,287,000