Segment Reporting (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) branch	Mar. 31, 2020 USD ($)
Segment Reporting [Abstract]
Number of branches | branch	14
Segment Reporting Information [Line Items]
Revenue	$ 103,556	$ 91,035
Gross profit	54,560	48,921
Operating income	4,810	18,638
Interest expense	323	115
Other income (expense), net	372	(1,111)
Income before income taxes	4,859	17,412
Lawson
Segment Reporting Information [Line Items]
Revenue	93,330	81,491
Gross profit	50,408	45,120
Operating income	4,256	18,094
Bolt Supply
Segment Reporting Information [Line Items]
Revenue	10,226	9,544
Gross profit	4,152	3,801
Operating income	$ 554	$ 544