Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net revenues	$ 19,556	$ 11,230
Cost of revenues	10,035	6,363
Gross margin	9,521	4,867
Operating expenses:
Selling expense	2,403	2,052
Engineering and product development expense	1,322	1,292
General and administrative expense	3,161	2,876
Restructuring and other charges	55	8
Total operating expenses	6,941	6,228
Operating income (loss)	2,580	(1,361)
Other expense	(2)	(32)
Earnings (loss) before income tax expense (benefit)	2,578	(1,393)
Income tax expense (benefit)	366	(250)
Net earnings (loss)	$ 2,212	$ (1,143)
Net earnings (loss) per common share - basic (in dollars per share)	$ 0.21	$ (0.11)
Weighted average common shares outstanding - basic (in shares)	10,329,449	10,220,853
Net earnings (loss) per common share - diluted (in dollars per share)	$ 0.21	$ (0.11)
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,525,826	10,220,853