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
Net revenues	$ 21,820	$ 13,275	$ 41,376	$ 24,505
Cost of revenues	10,858	7,208	20,893	13,571
Gross margin	10,962	6,067	20,483	10,934
Operating expenses:
Selling expense	2,605	1,761	5,008	3,813
Engineering and product development expense	1,356	1,217	2,678	2,509
General and administrative expense	3,769	2,850	6,930	5,726
Restructuring and other charges	197	38	252	46
Total operating expenses	7,927	5,866	14,868	12,094
Operating income (loss)	3,035	201	5,615	(1,160)
Other income (loss)	21	(18)	19	(50)
Earnings (loss) before income tax expense (benefit)	3,056	183	5,634	(1,210)
Income tax expense (benefit)	447	13	813	(237)
Net earnings (loss)	$ 2,609	$ 170	$ 4,821	$ (973)
Net earnings (loss) per common share - basic (in dollars per share)	$ 0.25	$ 0.02	$ 0.46	$ (0.10)
Weighted average common shares outstanding - basic (in shares)	10,442,916	10,252,490	10,386,183	10,236,672
Net earnings (loss) per common share - diluted (in dollars per share)	$ 0.24	$ 0.02	$ 0.45	$ (0.10)
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,764,936	10,258,917	10,645,381	10,236,672