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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018
Number of Reportable Segments | 3 |  |
LIFO Inventory Amount | $ 50.3 | $ 39.1 |
Percentage of LIFO Inventory | 21.00% | 14.30% |
Software and Software Development Costs [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |
Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 2 years |  |
Minimum [Member] | Software and Software Development Costs [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 2 years |  |
Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 30 years |  |
Maximum [Member] | Software and Software Development Costs [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |
Steel Requirements [Member] | Supplier Concentration Risk [Member] | Three Largest Suppliers [Member] |  |  |
Concentration Risk, Percentage | 56.00% | 57.00% | 52.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Top 20 [Member] |  |  |
Concentration Risk, Percentage | 25.00% | 29.00% | 29.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Largest Customer [Member] |  |  |
Concentration Risk, Percentage | 2.00% | 5.00% | 5.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Industrial Machinery and Equipment Manufacturers and Fabricators [Member] |  |  |
Concentration Risk, Percentage | 45.00% | 46.00% | 48.00%

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