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Segment Information Segment Reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) Segment	Jun. 30, 2018 USD ($)
Segment Reporting [Abstract]
Number of Reportable Segments | Segment			2
Segment Reporting Information [Line Items]
Total revenue	$ 96,097	$ 90,382	$ 187,440	$ 174,841
Gross profit	51,043	49,131	99,966	95,349
Operating Income (Loss)	1,623	5,554	7,167	7,391
Interest Expense	146	264	343	504
Other Nonoperating Income (Expense)	339	(777)	811	(490)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	1,816	4,513	7,635	6,397
Lawson [Member]
Segment Reporting Information [Line Items]
Revenue	84,967	80,617	167,434	157,043
Gross profit	46,757	45,297	92,376	88,219
Operating Income (Loss)	654	4,794	6,113	6,284
Bolt [Member]
Segment Reporting Information [Line Items]
Revenue	11,130	9,765	20,006	17,798
Gross profit	4,286	3,834	7,590	7,130
Operating Income (Loss)	969	760	1,054	1,107
Product [Member]
Segment Reporting Information [Line Items]
Revenue	85,996	80,397	167,911	155,367
Product [Member] | Lawson [Member]
Segment Reporting Information [Line Items]
Revenue	74,866	70,632	147,905	137,569
Gross profit	41,130	38,707	81,734	75,549
Service [Member]
Segment Reporting Information [Line Items]
Revenue	10,101	9,985	19,529	19,474
Service [Member] | Lawson [Member]
Segment Reporting Information [Line Items]
Gross profit	$ 5,627	$ 6,590	$ 10,642	$ 12,670

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