CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
Net sales	$ 35,887	$ 36,616	$ 73,858	$ 77,767
Cost of sales	24,722	26,343	53,026	54,790
Gross margin	11,165	10,273	20,832	22,977
Selling, general and administrative expense	6,084	5,906	12,036	11,570
Operating income	5,081	4,367	8,796	11,407
Interest income	1,295	992	2,519	1,939
Income before income taxes	6,376	5,359	11,315	13,346
Provision for income taxes	1,532	1,287	2,717	3,206
Net income	4,844	4,072	8,598	10,140
Other comprehensive income (loss), marketable securities adjustment:
Unrealized income (loss) arising during year, net	10	(72)	5	(102)
Comprehensive income	$ 4,854	$ 4,000	$ 8,603	$ 10,038
Net income per basic share	$ 0.39	$ 0.33	$ 0.70	$ 0.82
Net income per diluted share	$ 0.39	$ 0.33	$ 0.70	$ 0.82
Weighted average shares outstanding - basic	12,316	12,310	12,315	12,309
Weighted average shares outstanding - diluted	12,316	12,310	12,315	12,309