Segment Reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) branch	Jun. 30, 2020 USD ($)
Segment Reporting [Abstract]
Number of branches | branch			14
Segment Reporting Information [Line Items]
Revenue	$ 106,540	$ 72,146	$ 210,096	$ 163,181
Gross profit	54,620	38,313	109,180	87,234
Operating income	3,382	569	8,192	19,207
Interest expense	268	72	591	187
Other income (expense), net	639	511	1,011	(600)
Income before income taxes	3,753	1,008	8,612	18,420
Lawson
Segment Reporting Information [Line Items]
Revenue	94,861	63,214	188,191	144,705
Gross profit	49,901	34,873	100,309	79,993
Operating income	2,443	(202)	6,699	17,891
Bolt Supply
Segment Reporting Information [Line Items]
Revenue	11,679	8,932	21,905	18,476
Gross profit	4,719	3,440	8,871	7,241
Operating income	$ 939	$ 771	$ 1,493	$ 1,316