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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
Number of Reportable Segments | 3 |  |  |
LIFO Inventory Amount | $ 51.1 | $ 48.1 |  |
Percentage of LIFO Inventory | 13.90% | 17.50% |  |
Software and Software Development Costs [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |  |
Minimum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |  |
Minimum [Member] | Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 22.0
Operating Lease, Liability, Total |  |  |  | 22.0
Minimum [Member] | Software and Software Development Costs [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |  |
Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 30 years |  |  |
Maximum [Member] | Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | 27.0
Operating Lease, Liability, Total |  |  |  | $ 27.0
Maximum [Member] | Software and Software Development Costs [Member] |  |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |  |
Steel Requirements [Member] | Supplier Concentration Risk [Member] | Three Largest Suppliers [Member] |  |  |  |
Concentration Risk, Percentage | 52.00% | 53.00% | 54.00% |
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Top 20 [Member] |  |  |  |
Concentration Risk, Percentage | 29.00% | 27.00% | 29.00% |
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Largest Customer [Member] |  |  |  |
Concentration Risk, Percentage | 5.00% | 4.00% | 4.00% |
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Industrial Machinery and Equipment Manufacturers and Fabricators [Member] |  |  |  |
Concentration Risk, Percentage | 48.00% | 51.00% | 51.00% |

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