CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME
Revenues	$ 80,092	$ 64,968	$ 236,649	$ 186,657
Cost of goods sold	56,330	45,422	166,816	131,529
Gross profit	23,762	19,546	69,833	55,128
Operating costs and expenses:
Selling	2,762	2,822	8,402	8,135
General and administrative	8,210	6,255	24,318	17,985
Engineering and development	4,692	4,389	14,610	12,984
Amortization of intangible assets	872	813	2,634	2,405
Total operating costs and expenses	16,536	14,279	49,964	41,509
Operating income	7,226	5,267	19,869	13,619
Other expense (income):
Interest expense	623	633	1,839	1,797
Other (income) expense, net	(24)	65	(118)	135
Total other expense, net	599	698	1,721	1,932
Income before income taxes	6,627	4,569	18,148	11,687
Provision for income taxes	(1,767)	(1,512)	(4,859)	(3,746)
Net income	$ 4,860	$ 3,057	$ 13,289	$ 7,941
Basic earnings per share:
Earnings per share (in dollars per share)	$ 0.52	$ 0.33	$ 1.44	$ 0.87
Basic weighted average common shares (in shares)	9,273	9,173	9,251	9,137
Diluted earnings per share:
Earnings per share (in dollars per share)	$ 0.52	$ 0.33	$ 1.42	$ 0.86
Diluted weighted average common shares (in shares)	9,371	9,294	9,337	9,265
Net income	$ 4,860	$ 3,057	$ 13,289	$ 7,941
Other comprehensive income:
Foreign currency translation adjustment	(307)	1,829	(2,152)	5,608
Income (loss) on derivatives	137	45	988	(178)
Comprehensive income	$ 4,690	$ 4,931	$ 12,125	$ 13,371