Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net revenues	$ 20,160	$ 17,352	$ 60,128	$ 47,420
Cost of revenues	10,068	8,556	29,731	22,475
Gross margin	10,092	8,796	30,397	24,945
Operating expenses:
Selling expense	2,291	2,322	7,305	5,861
Engineering and product development expense	1,207	1,139	3,733	3,056
General and administrative expense	3,318	3,143	9,643	8,423
Adjustment to contingent consideration liability	3,057	(549)	4,073	(549)
Total operating expenses	9,873	6,055	24,754	16,791
Operating income	219	2,741	5,643	8,154
Other income (expense)	(57)	100	(103)	195
Earnings before income tax expense	162	2,841	5,540	8,349
Income tax expense	728	823	1,711	2,808
Net earnings (loss)	$ (566)	$ 2,018	$ 3,829	$ 5,541
Net earnings (loss) per common share - basic (in dollars per share)	$ (0.05)	$ 0.20	$ 0.37	$ 0.54
Weighted average common shares outstanding - basic (in shares)	10,355,673	10,288,325	10,341,552	10,276,682
Net earnings (loss) per common share - diluted (in dollars per share)	$ (0.05)	$ 0.19	$ 0.37	$ 0.54
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,355,673	10,351,009	10,377,505	10,327,080