Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net revenues	$ 14,352	$ 21,097	$ 32,414	$ 39,968
Cost of revenues	7,633	10,187	16,859	19,663
Gross margin	6,719	10,910	15,555	20,305
Operating expenses:
Selling expense	2,087	2,538	4,461	5,014
Engineering and product development expense	1,208	1,230	2,492	2,526
General and administrative expense	3,718	3,335	7,455	6,325
Adjustment to contingent consideration liability		(710)		1,016
Total operating expenses	7,013	6,393	14,408	14,881
Operating income (loss)	(294)	4,517	1,147	5,424
Other income (loss)	(6)	(121)	15	(46)
Earnings (loss) before income tax expense (benefit)	(300)	4,396	1,162	5,378
Income tax expense (benefit)	(113)	382	211	983
Net earnings (loss)	$ (187)	$ 4,014	$ 951	$ 4,395
Net earnings (loss) per common share - basic (in dollars per share)	$ (0.02)	$ 0.39	$ 0.09	$ 0.43
Weighted average common shares outstanding - basic (in shares)	10,411,276	10,342,674	10,398,147	10,334,492
Net earnings (loss) per common share - diluted (in dollars per share)	$ (0.02)	$ 0.39	$ 0.09	$ 0.42
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,411,276	10,370,318	10,419,914	10,367,812