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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
LIFO Inventory Amount |  | $ 46.3 | $ 55.4 |
Percentage of LIFO Inventory |  | 11.10% | 11.40% |
Maximum [Member] |  |  |  |
Property, Plant and Equipment, Useful Life |  | 30 years |  |
Steel Requirements [Member] | Supplier Concentration Risk [Member] | Three Largest Suppliers [Member] |  |  |  |
Concentration Risk, Percentage |  | 39.00% | 51.00% | 56.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Top 20 [Member] |  |  |  |
Concentration Risk, Percentage | 23.00% | 26.00% |  | 25.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Largest Customer [Member] |  |  |  |
Concentration Risk, Percentage |  | 3.00% | 2.00% | 2.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Industrial Machinery and Equipment Manufacturers and Fabricators [Member] |  |  |  |
Concentration Risk, Percentage |  | 52.00% | 47.00% | 45.00%

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