Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net sales	$ 138,337	$ 120,213	$ 274,589	$ 232,833
Cost of sales	120,079	103,933	241,449	201,777
Amortization of intangible assets	1,738	2,677	3,476	5,353
Profit sharing, bonuses, and deferred compensation	1,208	3,210	3,755	6,074
Employee stock ownership plan expense	1,330	228	1,820	701
Other selling, general and administrative expenses	6,396	5,362	12,121	10,059
Impairment of long-lived assets and (gain) loss on contract	(906)		(2,089)
Income from operations	8,492	4,803	14,057	8,869
Interest expense	(765)	(504)	(1,332)	(1,036)
Income before taxes	7,727	4,299	12,725	7,833
Income tax expense	1,798	1,007	2,974	1,996
Net income and comprehensive income	$ 5,929	$ 3,292	$ 9,751	$ 5,837
Earnings per share:
Basic	$ 0.29	$ 0.16	$ 0.48	$ 0.29
Diluted	$ 0.29	$ 0.16	$ 0.47	$ 0.28
Weighted average shares outstanding:
Basic	20,581,945	20,454,541	20,490,944	20,316,936
Diluted	20,650,551	20,864,531	20,807,677	20,685,741