CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
Revenues	$ 60,479	$ 62,069	$ 120,059	$ 122,504
Cost of goods sold	42,492	43,501	84,572	86,844
Gross margin	17,987	18,568	35,487	35,660
Operating costs and expenses:
Selling	2,063	2,232	4,271	4,342
General and administrative	5,822	6,709	11,375	12,925
Engineering and development	3,707	3,472	7,153	6,989
Amortization of intangible assets	660	670	1,322	1,348
Total operating costs and expenses	12,252	13,083	24,121	25,604
Operating income	5,735	5,485	11,366	10,056
Other expense (income):
Interest expense	1,511	1,649	3,026	3,287
Other (expense) income, net	(19)	53	(285)	(299)
Total other expense, net	1,492	1,702	2,741	2,988
Income before income taxes	4,243	3,783	8,625	7,068
Provision for income taxes	(1,118)	(1,090)	(2,524)	(2,227)
Net income	$ 3,125	$ 2,693	$ 6,101	$ 4,841
Basic earnings per share:
Earnings per share (in dollars per share)	$ 0.34	$ 0.29	$ 0.66	$ 0.53
Basic weighted average common shares (in shares)	9,264	9,152	9,225	9,136
Diluted earnings per share:
Earnings per share (in dollars per share)	$ 0.34	$ 0.29	$ 0.66	$ 0.53
Diluted weighted average common shares (in shares)	9,264	9,152	9,225	9,136
Net income	$ 3,125	$ 2,693	$ 6,101	$ 4,841
Foreign currency translation adjustment	917	(332)	(3,562)	(325)
Change in accumulated income (loss) on derivatives	41	(89)	(59)	(98)
Comprehensive income	$ 4,083	$ 2,272	$ 2,480	$ 4,418