Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net sales	$ 108,605	$ 143,732
Cost of sales	96,762	124,153
Amortization of intangibles	2,677	2,677
Profit sharing, bonuses, and deferred compensation	1,325	1,750
Employee stock ownership plan expense	675	1,500
Other selling, general and administrative expenses	5,599	6,723
Contingent consideration revaluation		869
Income from operations	1,567	6,060
Interest expense	(826)	(2,832)
Income before taxes	741	3,228
Income tax expense	691	769
Net income and comprehensive income	50	2,459
Earnings per share
Net income available to shareholders	$ 50	$ 2,459
Basic and diluted earnings per share	$ 0.00	$ 0.18
Basic and diluted weighted average shares outstanding	19,533,533	13,443,484
Tax-adjusted pro forma information
Net income available to shareholders	$ 50	$ 2,459
Pro forma provision for income taxes		70
Pro forma net income	$ 50	$ 2,389
Pro forma basic and diluted earnings per share	$ 0.00	$ 0.18
Basic and diluted weighted average shares outstanding	19,533,533	13,443,484