CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
Revenues	$ 79,981	$ 60,335	$ 156,557	$ 121,689
Cost of goods sold	56,464	42,454	110,486	86,107
Gross profit	23,517	17,881	46,071	35,582
Operating costs and expenses:
Selling	2,943	2,710	5,640	5,313
General and administrative	8,336	5,981	15,792	11,730
Engineering and development	4,963	4,404	9,918	8,595
Business development	165		316
Amortization of intangible assets	878	799	1,762	1,592
Total operating costs and expenses	17,285	13,894	33,428	27,230
Operating income	6,232	3,987	12,643	8,352
Other expense (income):
Interest expense	602	641	1,216	1,164
Other (income) expense, net	(200)	80	(94)	70
Total other expense, net	402	721	1,122	1,234
Income before income taxes	5,830	3,266	11,521	7,118
Provision for income taxes	(1,599)	(1,039)	(3,092)	(2,234)
Net income	$ 4,231	$ 2,227	$ 8,429	$ 4,884
Basic earnings per share:
Earnings per share (in dollars per share)	$ 0.46	$ 0.24	$ 0.91	$ 0.54
Basic weighted average common shares (in shares)	9,268	9,165	9,241	9,120
Diluted earnings per share:
Earnings per share (in dollars per share)	$ 0.45	$ 0.24	$ 0.90	$ 0.53
Diluted weighted average common shares (in shares)	9,356	9,265	9,321	9,250
Net income	$ 4,231	$ 2,227	$ 8,429	$ 4,884
Other comprehensive income:
Foreign currency translation adjustment	(3,532)	3,105	(1,845)	3,779
Change in accumulated income (loss) on derivatives	247	(137)	851	(223)
Comprehensive income	$ 946	$ 5,195	$ 7,435	$ 8,440