CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Net sales	$ 41,675	$ 36,253	$ 83,725	$ 72,177
Cost of sales	28,046	24,947	58,016	49,836
Gross margin	13,629	11,306	25,709	22,341
Selling, general and administrative expense	5,884	5,548	11,658	10,766
Operating income	7,745	5,758	14,051	11,575
Interest income	337	318	551	656
Income before income taxes	8,082	6,076	14,602	12,231
Provision for income taxes	1,906	1,456	3,442	2,926
Net income	6,176	4,620	11,160	9,305
Net income - basic	6,176	4,620	11,160	9,305
Net income - diluted	$ 6,176	$ 4,620	$ 11,160	$ 9,305
Net income per basic share	$ 0.50	$ 0.37	$ 0.90	$ 0.75
Net income per diluted share	$ 0.50	$ 0.37	$ 0.90	$ 0.75
Weighted average shares outstanding - basic	12,367	12,403	12,374	12,423
Weighted average shares outstanding - diluted	12,367	12,403	12,374	12,423