Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net sales	$ 321,623,000	$ 355,777,000	$ 352,627,000
Cost of sales	266,498,000	291,381,000	267,705,000
Gross profit	55,125,000	64,396,000	84,922,000
Selling and general expenses	27,121,000	34,153,000	28,505,000
Intangibles amortization	582,000	214,000	221,000
Impairments - goodwill and intangible assets	5,295,000	0	0
Operating profit	22,127,000	30,029,000	56,196,000
Other income	3,817,000	2,430,000	3,792,000
Earnings before provision for income taxes	25,944,000	32,459,000	59,988,000
Provision for income taxes	5,245,000	6,805,000	13,030,000
Net earnings	$ 20,699,000	$ 25,654,000	$ 46,958,000
Weighted average common shares outstanding:
Basic and diluted (in shares)	7,081	7,060	7,038
Earnings per share, basic and diluted:
Net earnings per share (in dollars per share)	$ 2.92	$ 3.63	$ 6.67
Comprehensive income:
Net earnings	$ 20,699,000	$ 25,654,000	$ 46,958,000
Other comprehensive income, net of tax:
Unrealized gain on available-for-sale securities, net of tax	(123,000)	(134,000)	18,000
Comprehensive income	$ 20,576,000	$ 25,520,000	$ 46,976,000