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Segment Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Interest Expense                 $ 622,000 $ 496,000 $ 766,000
Net sales $ 80,633,000 $ 75,651,000 $ 75,006,000 $ 74,617,000 $ 67,315,000 $ 70,199,000 $ 69,348,000 $ 69,711,000 305,907,000 276,573,000 275,834,000
Gross Profit 46,993,000 $ 46,005,000 $ 45,141,000 $ 44,879,000 40,504,000 $ 42,573,000 $ 42,526,000 $ 42,459,000 183,018,000 168,062,000 169,124,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property                 5,422,000 0 0
Other Operating Income (Expense), Net                 0 0 (931,000)
Operating Income (Loss)                 9,936,000 (1,457,000) 2,121,000
Long-Lived Assets 59,008,000       37,466,000       59,008,000 37,466,000 34,055,000
Other Nonoperating Income (Expense)                 780,000 422,000 (203,000)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest                 10,094,000 (1,531,000) 1,152,000
Payments to Acquire Property, Plant, and Equipment                 1,256,000 3,112,000 2,342,000
Depreciation, Depletion and Amortization                 6,770,000 8,066,000 8,543,000
Assets 190,667,000       135,307,000       190,667,000 135,307,000 133,094,000
Notes Receivable, Related Parties (8,832,000)       0       (8,832,000) 0 0
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 266,994,000 250,824,000 251,129,000
Long-Lived Assets 24,686,000       30,041,000       24,686,000 30,041,000 33,813,000
Canada                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 38,913,000 25,749,000 24,705,000
Long-Lived Assets 34,322,000       7,425,000       34,322,000 7,425,000 242,000
Lawson [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 297,953,000 276,573,000 275,834,000
Gross Profit                 179,578,000 168,062,000 169,124,000
Operating Income (Loss)                 3,958,000 (1,457,000) 3,052,000
Payments to Acquire Property, Plant, and Equipment                 1,251,000 3,112,000 2,342,000
Depreciation, Depletion and Amortization                 6,486,000 8,066,000 8,543,000
Assets 161,076,000       135,307,000       161,076,000 135,307,000 133,094,000
Bolt [Member] [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 7,954,000 0 0
Gross Profit                 3,440,000 0 0
Operating Income (Loss)                 556,000 0 0
Payments to Acquire Property, Plant, and Equipment                 5,000 0 0
Depreciation, Depletion and Amortization                 284,000 0 0
Assets $ 38,423,000       $ 0       $ 38,423,000 $ 0 $ 0