CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
Revenues	$ 94,653	$ 96,633	$ 273,696	$ 283,159
Cost of goods sold	66,513	66,603	191,054	197,045
Gross profit	28,140	30,030	82,642	86,114
Operating costs and expenses:
Selling	3,734	4,144	11,819	12,373
General and administrative	10,008	9,932	28,880	28,451
Engineering and development	6,434	5,705	18,865	17,188
Business development	8	8	432	64
Amortization of intangible assets	1,499	1,429	4,423	4,291
Total operating costs and expenses	21,683	21,218	64,419	62,367
Operating income	6,457	8,812	18,223	23,747
Other expense:
Interest expense	844	1,359	2,799	3,974
Other expense, net	231	140	307	121
Total other expense, net	1,075	1,499	3,106	4,095
Income before income taxes	5,382	7,313	15,117	19,652
Provision for income taxes	(1,369)	(2,695)	(4,173)	(6,119)
Net income	$ 4,013	$ 4,618	$ 10,944	$ 13,533
Basic earnings per share:
Earnings per share (in dollars per share)	$ 0.42	$ 0.49	$ 1.15	$ 1.44
Basic weighted average common shares (in shares)	9,514	9,414	9,487	9,390
Diluted earnings per share:
Earnings per share (in dollars per share)	$ 0.42	$ 0.49	$ 1.15	$ 1.43
Diluted weighted average common shares (in shares)	9,579	9,464	9,539	9,435
Net income	$ 4,013	$ 4,618	$ 10,944	$ 13,533
Other comprehensive income:
Foreign currency translation adjustment	3,433	(2,369)	2,937	(2,708)
Gain (loss) on derivatives	70	(105)	(1,347)	(803)
Comprehensive income	$ 7,516	$ 2,144	$ 12,534	$ 10,022