Segment Reporting (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) branch	Sep. 30, 2020 USD ($)
Segment Reporting [Abstract]
Number of branches | branch			14
Segment Reporting Information [Line Items]
Revenue	$ 105,570	$ 90,277	$ 315,666	$ 253,458
Gross profit	56,046	47,225	165,226	134,459
Operating income	4,620	2,001	12,812	21,208
Interest expense	119	142	710	329
Other income (expense), net	(209)	615	802	15
Income before income taxes	4,292	2,474	12,904	20,894
Lawson
Segment Reporting Information [Line Items]
Revenue	93,686	79,806	281,877	224,511
Gross profit	51,127	43,038	151,436	123,031
Operating income	3,488	1,112	10,188	19,003
Bolt Supply
Segment Reporting Information [Line Items]
Revenue	11,884	10,471	33,789	28,947
Gross profit	4,919	4,187	13,790	11,428
Operating income	$ 1,132	$ 889	$ 2,624	$ 2,205