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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021
Number of Reportable Segments | 3 |  |
LIFO Inventory Amount | $ 38.2 | $ 46.3 |
Percentage of LIFO Inventory | 9.90% | 11.10% |
Property, Plant and Equipment, Useful Life (Year) | 7 years |  |
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 | 40.00% | 39.00% | 51.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Top 20 [Member] |  |  |
Concentration Risk, Percentage | 29.00% | 26.00% | 23.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Largest Customer [Member] |  |  |
Concentration Risk, Percentage | 3.00% | 3.00% | 2.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Industrial Machinery and Equipment Manufacturers and Fabricators [Member] |  |  |
Concentration Risk, Percentage | 48.00% | 52.00% | 47.00%

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