Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net revenues	$ 21,097	$ 15,888	$ 39,968	$ 30,068
Cost of revenues	10,187	7,467	19,663	13,919
Gross margin	10,910	8,421	20,305	16,149
Operating expenses:
Selling expense	2,538	1,871	5,014	3,539
Engineering and product development expense	1,230	982	2,526	1,917
General and administrative expense	3,335	3,286	6,325	5,280
Adjustment to contingent consideration liability	(710)		1,016
Total operating expenses	6,393	6,139	14,881	10,736
Operating income	4,517	2,282	5,424	5,413
Other income (loss)	(121)	54	(46)	95
Earnings before income tax expense	4,396	2,336	5,378	5,508
Income tax expense	382	891	983	1,985
Net earnings	$ 4,014	$ 1,445	$ 4,395	$ 3,523
Net earnings per common share - basic (in dollars per share)	$ 0.39	$ 0.14	$ 0.43	$ 0.34
Weighted average common shares outstanding - basic (in shares)	10,342,674	10,277,155	10,334,492	10,270,860
Net earnings per common share - diluted (in dollars per share)	$ 0.39	$ 0.14	$ 0.42	$ 0.34
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,370,318	10,334,894	10,367,812	10,315,115