CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
Revenues	$ 60,335	$ 65,835	$ 121,689	$ 129,510
Cost of goods sold	42,454	45,971	86,107	91,141
Gross margin	17,881	19,864	35,582	38,369
Operating costs and expenses:
Selling	2,710	2,635	5,313	5,059
General and administrative	5,981	5,878	11,730	12,287
Engineering and development	4,404	4,174	8,595	8,224
Business development		135		218
Amortization of intangible assets	799	828	1,592	1,607
Total operating costs and expenses	13,894	13,650	27,230	27,395
Operating income	3,987	6,214	8,352	10,974
Other expense (income):
Interest expense	641	1,590	1,164	3,122
Other expense, net	80	(130)	70	(115)
Total other expense, net	721	1,460	1,234	3,007
Income before income taxes	3,266	4,754	7,118	7,967
Provision for income taxes	(1,039)	(1,561)	(2,234)	(2,419)
Net income	$ 2,227	$ 3,193	$ 4,884	$ 5,548
Basic earnings per share:
Earnings per share	$ 0.24	$ 0.34	$ 0.54	$ 0.60
Basic weighted average common shares	9,165	9,343	9,120	9,312
Diluted earnings per share:
Earnings per share	$ 0.24	$ 0.34	$ 0.53	$ 0.60
Diluted weighted average common shares	9,265	9,343	9,250	9,312
Net income	$ 2,227	$ 3,193	$ 4,884	$ 5,548
Foreign currency translation adjustment	3,105	(1,066)	3,779	963
Change in accumulated (loss) income on derivatives	(137)	(17)	(223)	(122)
Comprehensive income	$ 5,195	$ 2,110	$ 8,440	$ 6,389