Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues	$ 5,461	$ 6,368	$ 12,748	$ 11,903
Costs and expenses:
Cost of sales	3,465	3,690	7,947	6,935
Selling, general and administrative	2,915	2,874	6,160	5,928
Research and development	413	289	631	509
Costs and Expenses	6,793	6,853	14,738	13,372
Operating loss	(1,332)	(485)	(1,990)	(1,469)
Interest expense	(5)	(4)	(10)	(9)
Interest income	307	8	646	9
Other (expense) income, net	(14)	134	(104)	124
Loss before income taxes	(1,044)	(347)	(1,458)	(1,345)
Income tax expense	0	(9)	0	(9)
Net loss	$ (1,044)	$ (356)	$ (1,458)	$ (1,354)
Net loss per common share:
Basic net loss per common share (in dollars per share)	$ (0.03)	$ (0.01)	$ (0.05)	$ (0.04)
Diluted net loss per common share (in dollars per share)	$ (0.03)	$ (0.01)	$ (0.05)	$ (0.04)
Weighted-average number of common shares outstanding:
Basic (in shares)	30,324,000	30,296,000	30,310,000	30,282,000
Diluted (in shares)	30,324,000	30,296,000	30,310,000	30,282,000