CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
Revenues	$ 103,509	$ 94,653	$ 306,723	$ 273,696
Cost of goods sold	71,488	66,513	213,417	191,054
Gross profit	32,021	28,140	93,306	82,642
Operating costs and expenses:
Selling	4,365	3,734	12,979	11,819
General and administrative	10,620	10,008	32,549	28,880
Engineering and development	6,768	6,434	20,967	18,865
Business development	94	8	268	432
Amortization of intangible assets	1,504	1,499	4,527	4,423
Total operating costs and expenses	23,351	21,683	71,290	64,419
Operating income	8,670	6,457	22,016	18,223
Other expense, net:
Interest expense	777	844	2,445	2,799
Other (income) expense, net	(29)	231	(158)	307
Total other expense, net	748	1,075	2,287	3,106
Income before income taxes	7,922	5,382	19,729	15,117
Income tax (provision) benefit	(1,950)	(1,369)	2,804	(4,173)
Net income	$ 5,972	$ 4,013	$ 22,533	$ 10,944
Basic earnings per share:
Earnings per share	$ 0.41	$ 0.28	$ 1.57	$ 0.77
Basic weighted average common shares	14,411	14,271	14,375	14,231
Diluted earnings per share:
Earnings per share	$ 0.41	$ 0.28	$ 1.56	$ 0.76
Diluted weighted average common shares	14,502	14,369	14,478	14,309
Net income	$ 5,972	$ 4,013	$ 22,533	$ 10,944
Other comprehensive income:
Foreign currency translation adjustment	(2,528)	3,433	(5,580)	2,937
Gain (loss) on derivatives	155	70	919	(1,347)
Comprehensive income	$ 3,599	$ 7,516	$ 17,872	$ 12,534