CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
Revenues	$ 61,534	$ 65,280	$ 181,593	$ 187,784
Cost of goods sold	42,595	45,668	127,167	132,512
Gross margin	18,939	19,612	54,426	55,272
Operating costs and expenses:
Selling	1,963	2,277	6,234	6,619
General and administrative	5,939	6,172	17,314	19,097
Engineering and development	3,345	3,204	10,498	10,193
Amortization of intangible assets	661	697	1,983	2,045
Total operating costs and expenses	11,908	12,350	36,029	37,954
Operating income	7,031	7,262	18,397	17,318
Other expense (income):
Interest expense	1,504	1,607	4,530	4,895
Other expense, net	(115)	(368)	(400)	(668)
Total other expense, net	1,389	1,239	4,130	4,227
Income before income taxes	5,642	6,023	14,267	13,091
Provision for income taxes	(1,364)	(1,908)	(3,888)	(4,135)
Net income	$ 4,278	$ 4,115	$ 10,379	$ 8,956
Basic earnings per share:
Earnings per share (in dollars per share)	$ 0.46	$ 0.45	$ 1.12	$ 0.98
Basic weighted average common shares (in shares)	9,266	9,157	9,239	9,143
Diluted earnings per share:
Earnings per share (in dollars per share)	$ 0.46	$ 0.45	$ 1.12	$ 0.98
Diluted weighted average common shares (in shares)	9,266	9,157	9,239	9,143
Net income	$ 4,278	$ 4,115	$ 10,379	$ 8,956
Foreign currency translation adjustment	400	(3,214)	(3,162)	(325)
Change in accumulated (loss) income on derivatives	(87)	113	(146)	(98)
Comprehensive income	$ 4,591	$ 1,014	$ 7,071	$ 8,533