Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net sales	$ 112,620	$ 108,605
Cost of sales	97,844	96,762
Amortization of intangibles	2,677	2,677
Profit sharing, bonuses, and deferred compensation	2,865	1,325
Employee stock ownership plan expense	473	675
Other selling, general and administrative expenses	4,695	5,599
Income from operations	4,066	1,567
Interest expense	(532)	(826)
Income before taxes	3,534	741
Income tax expense	989	691
Net income and comprehensive income	$ 2,545	$ 50
Earnings per share:
Basic	$ 0.13	$ 0.00
Diluted	$ 0.12	$ 0.00
Weighted average shares outstanding:
Basic	20,177,900	19,533,533
Diluted	20,667,684	19,533,533