CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
Revenues	$ 76,576	$ 61,354
Cost of goods sold	54,022	43,653
Gross profit	22,554	17,701
Operating costs and expenses:
Selling	2,697	2,603
General and administrative	7,456	5,749
Engineering and development	4,955	4,191
Business development	151
Amortization of intangible assets	884	793
Total operating costs and expenses	16,143	13,336
Operating income	6,411	4,365
Other expense (income):
Interest expense	614	523
Other expense, net	106	(10)
Total other expense, net	720	513
Income before income taxes	5,691	3,852
Provision for income taxes	(1,493)	(1,195)
Net income	$ 4,198	$ 2,657
Basic earnings per share:
Earnings per share (in dollars per share)	$ 0.45	$ 0.29
Basic weighted average common shares (in shares)	9,251	9,068
Diluted earnings per share:
Earnings per share (in dollars per share)	$ 0.45	$ 0.29
Diluted weighted average common shares (in shares)	9,325	9,229
Net income	$ 4,198	$ 2,657
Other comprehensive income:
Foreign currency translation adjustment	1,687	674
Change in accumulated gain (loss) on derivatives	604	(86)
Comprehensive income	$ 6,489	$ 3,245