Segment Information Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net Sales	$ 349,637,000	$ 305,907,000
Gross Profit	189,540,000	183,018,000
Operating Income (Loss)	9,210,000	9,936,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	0	5,422,000
Interest Expense	(1,009,000)	(622,000)
Other Nonoperating Income (Expense)	(1,338,000)	780,000
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	6,863,000	10,094,000
Payments to Acquire Property, Plant, and Equipment	2,524,000	1,256,000
Depreciation, Depletion and Amortization	6,855,000	6,770,000
Assets	197,142,000	191,111,000
Notes Receivable, Related Parties	(8,141,000)	(8,832,000)
Lawson [Member]
Segment Reporting Information [Line Items]
Net Sales	313,095,000	297,953,000
Gross Profit	175,517,000	179,578,000
Operating Income (Loss)	7,500,000	4,164,000
Payments to Acquire Property, Plant, and Equipment	1,907,000	1,251,000
Depreciation, Depletion and Amortization	6,008,000	6,280,000
Assets	169,216,000	161,520,000
Bolt [Member] [Member]
Segment Reporting Information [Line Items]
Net Sales	36,542,000	7,954,000
Gross Profit	14,023,000	3,440,000
Operating Income (Loss)	1,710,000	350,000
Payments to Acquire Property, Plant, and Equipment	617,000	5,000
Depreciation, Depletion and Amortization	847,000	490,000
Assets	$ 36,067,000	$ 38,423,000