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Segment Information Segment Reporting (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Segment	Sep. 30, 2018 USD ($)
Segment Reporting [Abstract]
Number of Reportable Segments | Segment			2
Segment Reporting Information [Line Items]
Total revenue	$ 94,779	$ 88,530	$ 282,219	$ 263,371
Gross profit	50,574	48,108	150,540	143,457
Operating Income (Loss)	6,446	(2,266)	13,613	5,125
Interest Expense	138	251	481	755
Other Nonoperating Income (Expense)	(13)	170	798	(320)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	6,295	(2,347)	13,930	4,050
Lawson [Member]
Segment Reporting Information [Line Items]
Revenue	83,461	78,692	250,895	235,735
Gross profit	46,148	44,452	138,524	132,671
Operating Income (Loss)	5,377	(2,754)	11,490	3,530
Bolt [Member]
Segment Reporting Information [Line Items]
Revenue	11,318	9,838	31,324	27,636
Gross profit	4,426	3,656	12,016	10,786
Operating Income (Loss)	1,069	488	2,123	1,595
Product [Member]
Segment Reporting Information [Line Items]
Revenue	84,440	78,377	252,351	233,744
Product [Member] | Lawson [Member]
Segment Reporting Information [Line Items]
Revenue	73,122	68,539	221,027	206,108
Gross profit	40,379	37,742	122,113	113,291
Service [Member]
Segment Reporting Information [Line Items]
Revenue	10,339	10,153	29,868	29,627
Service [Member] | Lawson [Member]
Segment Reporting Information [Line Items]
Gross profit	$ 5,769	$ 6,710	$ 16,411	$ 19,380

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