CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
Revenues	$ 93,896	$ 76,576
Cost of goods sold	66,234	54,022
Gross profit	27,662	22,554
Operating costs and expenses:
Selling	4,093	2,697
General and administrative	8,950	7,456
Engineering and development	5,807	4,955
Business development	53	151
Amortization of intangible assets	1,432	884
Total operating costs and expenses	20,335	16,143
Operating income	7,327	6,411
Other expense (income):
Interest expense	1,180	614
Other (income) expense, net	(18)	106
Total other expense, net	1,162	720
Income before income taxes	6,165	5,691
Provision for income taxes	(1,695)	(1,493)
Net income	$ 4,470	$ 4,198
Basic earnings per share:
Earnings per share (in dollars per share)	$ 0.48	$ 0.45
Basic weighted average common shares (in shares)	9,340	9,251
Diluted earnings per share:
Earnings per share (in dollars per share)	$ 0.48	$ 0.45
Diluted weighted average common shares (in shares)	9,375	9,325
Net income	$ 4,470	$ 4,198
Other comprehensive income:
Foreign currency translation adjustment	(887)	1,687
Income (loss) on derivatives	(262)	604
Comprehensive income	$ 3,321	$ 6,489