Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues	$ 7,851	$ 7,988	$ 19,850	$ 20,736
Costs and expenses:
Cost of sales	4,444	4,376	11,462	12,323
Selling, general and administrative	3,225	2,966	9,815	9,126
Research and development	361	513	1,159	1,144
Costs and Expenses	8,030	7,855	22,436	22,593
Operating (loss) income	(179)	133	(2,586)	(1,857)
Interest expense	0	(5)	0	(15)
Interest income	323	322	968	968
Other (expense) income, net	(63)	9	1,576	(95)
Income (loss) before income taxes	81	459	(42)	(999)
Income tax expense	(1)	0	(18)	0
Net income (loss)	$ 80	$ 459	$ (60)	$ (999)
Net income (loss) per common share:
Basic net income (loss) per common share (in dollars per share)	$ 0	$ 0.02	$ (0)	$ (0.03)
Diluted net income (loss) per common share (in dollars per share)	$ 0	$ 0.01	$ (0)	$ (0.03)
Weighted-average number of common shares outstanding:
Basic (in shares)	30,708,000	30,385,000	30,526,000	30,336,000
Diluted (in shares)	30,848,000	30,627,000	30,526,000	30,336,000