CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
Revenues	$ 86,661	$ 92,630	$ 179,043	$ 186,526
Cost of goods sold	60,201	64,208	124,541	130,442
Gross profit	26,460	28,422	54,502	56,084
Operating costs and expenses:
Selling	3,842	4,136	8,085	8,229
General and administrative	9,710	9,569	18,872	18,519
Engineering and development	6,197	5,676	12,431	11,483
Business development	177	3	424	56
Amortization of intangible assets	1,483	1,430	2,924	2,862
Total operating costs and expenses	21,409	20,814	42,736	41,149
Operating income	5,051	7,608	11,766	14,935
Other expense (income):
Interest expense	901	1,435	1,955	2,615
Other expense (income), net	17	(1)	76	(19)
Total other expense, net	918	1,434	2,031	2,596
Income before income taxes	4,133	6,174	9,735	12,339
Provision for income taxes	(1,237)	(1,729)	(2,804)	(3,424)
Net income	$ 2,896	$ 4,445	$ 6,931	$ 8,915
Basic earnings per share:
Earnings per share (in dollars per share)	$ 0.30	$ 0.47	$ 0.73	$ 0.95
Basic weighted average common shares (in shares)	9,509	9,408	9,474	9,378
Diluted earnings per share:
Earnings per share (in dollars per share)	$ 0.30	$ 0.47	$ 0.73	$ 0.95
Diluted weighted average common shares (in shares)	9,536	9,456	9,518	9,419
Net income	$ 2,896	$ 4,445	$ 6,931	$ 8,915
Other comprehensive income:
Foreign currency translation adjustment	1,932	548	(496)	(339)
Loss on derivatives	(329)	(436)	(1,417)	(698)
Comprehensive income	$ 4,499	$ 4,557	$ 5,018	$ 7,878