CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
Revenues	$ 101,677	$ 92,382
Cost of goods sold	71,609	64,340
Gross profit	30,068	28,042
Operating costs and expenses:
Selling	4,218	4,243
General and administrative	10,748	9,162
Engineering and development	6,959	6,234
Business development	19	247
Amortization of intangible assets	1,512	1,441
Total operating costs and expenses	23,456	21,327
Operating income	6,612	6,715
Other expense, net:
Interest expense	861	1,054
Other (income) expense, net	(119)	59
Total other expense, net	742	1,113
Income before income taxes	5,870	5,602
Income tax benefit (provision)	6,057	(1,567)
Net income	$ 11,927	$ 4,035
Basic earnings per share:
Earnings per share	$ 0.83	$ 0.28
Basic weighted average common shares	14,306	14,180
Diluted earnings per share:
Earnings per share	$ 0.83	$ 0.28
Diluted weighted average common shares	14,438	14,274
Net income	$ 11,927	$ 4,035
Other comprehensive income:
Foreign currency translation adjustment	(4,007)	(2,428)
Gain (loss) on derivatives	708	(1,088)
Comprehensive income	$ 8,628	$ 519