CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
Revenues	$ 92,630	$ 79,981	$ 186,526	$ 156,557
Cost of goods sold	64,208	56,464	130,442	110,486
Gross profit	28,422	23,517	56,084	46,071
Operating costs and expenses:
Selling	4,136	2,943	8,229	5,640
General and administrative	9,569	8,336	18,519	15,792
Engineering and development	5,676	4,963	11,483	9,918
Business development	3	165	56	316
Amortization of intangible assets	1,430	878	2,862	1,762
Total operating costs and expenses	20,814	17,285	41,149	33,428
Operating income	7,608	6,232	14,935	12,643
Other expense (income):
Interest expense	1,435	602	2,615	1,216
Other (income) expense, net	(1)	(200)	(19)	(94)
Total other expense, net	1,434	402	2,596	1,122
Income before income taxes	6,174	5,830	12,339	11,521
Provision for income taxes	(1,729)	(1,599)	(3,424)	(3,092)
Net income	$ 4,445	$ 4,231	$ 8,915	$ 8,429
Basic earnings per share:
Earnings per share (in dollars per share)	$ 0.47	$ 0.46	$ 0.95	$ 0.91
Basic weighted average common shares (in shares)	9,408	9,268	9,378	9,241
Diluted earnings per share:
Earnings per share (in dollars per share)	$ 0.47	$ 0.45	$ 0.95	$ 0.90
Diluted weighted average common shares (in shares)	9,456	9,356	9,419	9,321
Net income	$ 4,445	$ 4,231	$ 8,915	$ 8,429
Other comprehensive income:
Foreign currency translation adjustment	548	(3,532)	(339)	(1,845)
(Loss) income on derivatives	(436)	247	(698)	851
Comprehensive income	$ 4,557	$ 946	$ 7,878	$ 7,435