Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net sales	$ 340,912,000	$ 321,623,000	$ 355,777,000
Cost of sales	273,460,000	266,498,000	291,381,000
Gross profit	67,452,000	55,125,000	64,396,000
Selling and general expenses	30,784,000	27,121,000	34,153,000
Intangibles amortization	1,635,000	582,000	214,000
Impairments - goodwill and intangible assets	0	5,295,000	0
Operating profit	35,033,000	22,127,000	30,029,000
Other income	7,398,000	3,817,000	2,430,000
Earnings before provision for income taxes	42,431,000	25,944,000	32,459,000
Provision for income taxes	7,872,000	5,245,000	6,805,000
Net earnings	$ 34,559,000	$ 20,699,000	$ 25,654,000
Weighted average common shares outstanding:
Basic and diluted (in shares)	7,106	7,081	7,060
Earnings per share, basic and diluted:
Net earnings per share (in dollars per share)	$ 4.86	$ 2.92	$ 3.63
Comprehensive income:
Net earnings	$ 34,559,000	$ 20,699,000	$ 25,654,000
Other comprehensive income, net of tax:
Unrealized loss on available-for-sale securities, net of tax	125,000	(123,000)	(134,000)
Comprehensive income	$ 34,684,000	$ 20,576,000	$ 25,520,000