Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues	$ 5,218	$ 4,401	$ 10,251	$ 8,179
Costs and expenses:
Cost of sales	2,635	3,799	5,310	6,050
Selling, general and administrative	2,957	2,755	6,057	6,641
Research and development	315	271	730	595
Costs and Expenses, Total	5,907	6,825	12,097	13,286
Operating loss	(689)	(2,424)	(1,846)	(5,107)
Interest expense	(5)	(3)	(9)	(6)
Interest income	2	2	3	13
Other (expense) income, net	(76)	(88)	1,482	138
Loss before income taxes	(768)	(2,513)	(370)	(4,962)
Income tax expense	(10)	(31)	(10)	(149)
Net loss	$ (778)	$ (2,544)	$ (380)	$ (5,111)
Net loss per common share:
Basic net loss per common share (in dollars per share)	$ (0.03)	$ (0.10)	$ (0.01)	$ (0.21)
Diluted net loss per common share (in dollars per share)	$ (0.03)	$ (0.10)	$ (0.01)	$ (0.21)
Weighted-average number of common shares outstanding:
Basic (in shares)	30,264,000	24,668,000	28,895,000	24,633,000
Diluted (in shares)	30,264,000	24,668,000	28,895,000	24,633,000