CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Net sales	$ 42,864	$ 34,556	$ 126,589	$ 106,733
Cost of sales	30,928	23,634	88,944	73,470
Gross margin	11,936	10,922	37,645	33,263
Selling, general and administrative expense	6,016	5,791	17,674	16,557
Operating income	5,920	5,131	19,971	16,706
Interest income	558	289	1,109	945
Income before income taxes	6,478	5,420	21,080	17,651
Provision for income taxes	1,528	1,288	4,970	4,214
Net income	4,950	4,132	16,110	13,437
Net income - basic	4,950	4,132	16,110	13,437
Net income - diluted	$ 4,950	$ 4,132	$ 16,110	$ 13,437
Net income per basic share	$ 0.40	$ 0.33	$ 1.30	$ 1.08
Net income per diluted share	$ 0.40	$ 0.33	$ 1.30	$ 1.08
Weighted average shares outstanding - basic	12,307	12,406	12,352	12,417
Weighted average shares outstanding - diluted	12,307	12,406	12,352	12,417