Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 6,368	$ 5,218	$ 11,903	$ 10,251
Costs and expenses:
Cost of sales	3,690	2,635	6,935	5,310
Selling, general and administrative	2,874	2,957	5,928	6,057
Research and development	289	315	509	730
Costs and Expenses, Total	6,853	5,907	13,372	12,097
Operating loss	(485)	(689)	(1,469)	(1,846)
Interest expense	(4)	(5)	(9)	(9)
Interest income	8	2	9	3
Other income (expense), net	134	(76)	124	1,482
Loss before income taxes	(347)	(768)	(1,345)	(370)
Income tax expense	(9)	(10)	(9)	(10)
Net loss	$ (356)	$ (778)	$ (1,354)	$ (380)
Net loss per common share:
Basic net loss per common share (in dollars per share)	$ (0.01)	$ (0.03)	$ (0.04)	$ (0.01)
Diluted net loss per common share (in dollars per share)	$ (0.01)	$ (0.03)	$ (0.04)	$ (0.01)
Weighted-average number of common shares outstanding:
Basic (in shares)	30,296,000	30,264,000	30,282,000	28,895,000
Diluted (in shares)	30,296,000	30,264,000	30,282,000	28,895,000