Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net revenues	$ 13,275	$ 14,352	$ 24,505	$ 32,414
Cost of revenues	7,208	7,633	13,571	16,859
Gross margin	6,067	6,719	10,934	15,555
Operating expenses:
Selling expense	1,761	2,087	3,813	4,461
Engineering and product development expense	1,217	1,208	2,509	2,492
General and administrative expense	2,888	3,718	5,772	7,455
Total operating expenses	5,866	7,013	12,094	14,408
Operating income (loss)	201	(294)	(1,160)	1,147
Other income (loss)	(18)	(6)	(50)	15
Earnings (loss) before income tax expense (benefit)	183	(300)	(1,210)	1,162
Income tax expense (benefit)	13	(113)	(237)	211
Net earnings (loss)	$ 170	$ (187)	$ (973)	$ 951
Net earnings (loss) per common share - basic (in dollars per share)	$ 0.02	$ (0.02)	$ (0.10)	$ 0.09
Weighted average common shares outstanding - basic (in shares)	10,252,490	10,411,276	10,236,672	10,398,147
Net earnings (loss) per common share - diluted (in dollars per share)	$ 0.02	$ (0.02)	$ (0.10)	$ 0.09
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,258,917	10,411,276	10,236,672	10,419,914