CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
Revenues	$ 64,968	$ 61,040	$ 186,657	$ 190,550
Cost of goods sold	45,422	43,133	131,529	134,274
Gross profit	19,546	17,907	55,128	56,276
Operating costs and expenses:
Selling	2,822	2,431	8,135	7,490
General and administrative	6,255	5,264	17,985	17,551
Engineering and development	4,389	3,961	12,984	12,185
Business development		123		341
Amortization of intangible assets	813	802	2,405	2,409
Total operating costs and expenses	14,279	12,581	41,509	39,976
Operating income	5,267	5,326	13,619	16,300
Other expense (income):
Interest expense	633	1,504	1,797	4,626
Other expense, net	65	(75)	135	(190)
Total other expense, net	698	1,429	1,932	4,436
Income before income taxes	4,569	3,897	11,687	11,864
Provision for income taxes	(1,512)	(1,076)	(3,746)	(3,495)
Net income	$ 3,057	$ 2,821	$ 7,941	$ 8,369
Basic earnings per share:
Earnings per share (in dollars per share)	$ 0.33	$ 0.30	$ 0.87	$ 0.90
Basic weighted average common shares (in shares)	9,173	9,350	9,137	9,325
Diluted earnings per share:
Earnings per share (in dollars per share)	$ 0.33	$ 0.30	$ 0.86	$ 0.90
Diluted weighted average common shares (in shares)	9,294	9,350	9,265	9,325
Net income	$ 3,057	$ 2,821	$ 7,941	$ 8,369
Foreign currency translation adjustment	1,829	383	5,608	1,346
Change in accumulated (loss) income on derivatives	45	66	(178)	(56)
Comprehensive income (loss)	$ 4,931	$ 3,270	$ 13,371	$ 9,659