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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019
Number of Reportable Segments | 3 |  |
LIFO Inventory Amount | $ 55.4 | $ 50.3 |
Percentage of LIFO Inventory | 11.40% | 21.00% |
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 | 51.00% | 56.00% | 57.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Top 20 [Member] |  |  |
Concentration Risk, Percentage | 23.00% | 25.00% | 29.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Largest Customer [Member] |  |  |
Concentration Risk, Percentage | 2.00% | 2.00% | 5.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Industrial Machinery and Equipment Manufacturers and Fabricators [Member] |  |  |
Concentration Risk, Percentage | 47.00% | 45.00% | 46.00%

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