CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
Revenues	$ 101,537	$ 86,661	$ 203,214	$ 179,043
Cost of goods sold	70,320	60,201	141,929	124,541
Gross profit	31,217	26,460	61,285	54,502
Operating costs and expenses:
Selling	4,396	3,842	8,614	8,085
General and administrative	11,181	9,710	21,929	18,872
Engineering and development	7,240	6,197	14,199	12,431
Business development	155	177	174	424
Amortization of intangible assets	1,511	1,483	3,023	2,924
Total operating costs and expenses	24,483	21,409	47,939	42,736
Operating income	6,734	5,051	13,346	11,766
Other expense, net:
Interest expense	807	901	1,668	1,955
Other (income) expense, net	(10)	17	(129)	76
Total other expense, net	797	918	1,539	2,031
Income before income taxes	5,937	4,133	11,807	9,735
Income tax (provision) benefit	(1,303)	(1,237)	4,754	(2,804)
Net income	$ 4,634	$ 2,896	$ 16,561	$ 6,931
Basic earnings per share:
Earnings per share	$ 0.32	$ 0.20	$ 1.15	$ 0.49
Basic weighted average common shares	14,406	14,264	14,356	14,211
Diluted earnings per share:
Earnings per share	$ 0.32	$ 0.20	$ 1.14	$ 0.49
Diluted weighted average common shares	14,494	14,304	14,467	14,278
Net income	$ 4,634	$ 2,896	$ 16,561	$ 6,931
Other comprehensive income:
Foreign currency translation adjustment	955	1,932	(3,052)	(496)
Gain (loss) on derivatives	56	(329)	764	(1,417)
Comprehensive income	$ 5,645	$ 4,499	$ 14,273	$ 5,018