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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Number of Reportable Segments | 3 |  |
LIFO Inventory Amount | $ 48.1 | $ 43.4 |
Percentage of LIFO Inventory | 17.50% | 17.10% |
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] | 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] | 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 | 53.00% | 54.00% | 51.00%
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Top 20 [Member] |  |  |
Concentration Risk, Percentage | 27.00% | 29.00% | 31.00%
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Largest Customer [Member] |  |  |
Concentration Risk, Percentage | 4.00% | 4.00% | 6.00%
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] | Industrial Machinery and Equipment Manufacturers and Fabricators [Member] |  |  |
Concentration Risk, Percentage | 51.00% | 51.00% | 49.00%
Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member] | Engineered Products [Member] |  |  |
Concentration Risk, Percentage | 1.90% | 1.70% | 1.80%

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