Segment Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Interest Expense	$ 1,009,000	$ 622,000
Net sales	349,637,000	305,907,000
Gross Profit	189,540,000	183,018,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	0	5,422,000
Operating Income (Loss)	9,210,000	9,936,000
Long-Lived Assets	57,046,000	59,008,000
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)
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	279,917,000	266,994,000
Long-Lived Assets	25,539,000	24,686,000
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	69,720,000	38,913,000
Long-Lived Assets	31,507,000	34,322,000
Lawson [Member]
Revenues from External Customers and Long-Lived Assets [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]
Revenues from External Customers and Long-Lived Assets [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