CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
Revenues	$ 61,354	$ 63,675
Cost of goods sold	43,653	45,170
Gross margin	17,701	18,505
Operating costs and expenses:
Selling	2,603	2,424
General and administrative	5,749	6,409
Engineering and development	4,191	4,050
Business development		83
Amortization of intangible assets	793	779
Total operating costs and expenses	13,336	13,745
Operating income	4,365	4,760
Other expense (income):
Interest expense	523	1,532
Other expense, net	(10)	15
Total other expense, net	513	1,547
Income before income taxes	3,852	3,213
Provision for income taxes	(1,195)	(858)
Net income	$ 2,657	$ 2,355
Basic earnings per share:
Earnings per share (in dollars per share)	$ 0.29	$ 0.25
Basic weighted average common shares (in shares)	9,068	9,273
Diluted earnings per share:
Earnings per share (in dollars per share)	$ 0.29	$ 0.25
Diluted weighted average common shares (in shares)	9,229	9,273
Net income	$ 2,657	$ 2,355
Other comprehensive income:
Foreign currency translation adjustment	674	2,029
Change in accumulated loss on derivatives	(86)	(104)
Comprehensive income	$ 3,245	$ 4,280