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Note 4 - Revenue Recognition - Disaggregation of Revenues, Percentage (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Percentage of net sales | 100.00% | 100.00% | 100.00%
Carbon Flat Products [Member] |  |  |
Percentage of net sales | 26.30% | 30.30% | 25.40%
Specialty Metals Flat Products [Member] |  |  |
Percentage of net sales | 56.60% | 53.00% | 58.10%
Tubular and Pipe Products [Member] |  |  |
Percentage of net sales | 17.10% | 16.70% | 16.50%
Hot Rolled Products [Member] |  |  |
Percentage of net sales | 28.80% | 29.80% | 31.40%
Hot Rolled Products [Member] | Carbon Flat Products [Member] |  |  |
Percentage of net sales | 28.80% | 0.00% | 0.00%
Hot Rolled Products [Member] | Specialty Metals Flat Products [Member] |  |  |
Percentage of net sales | 0.00% | 29.80% | 31.40%
Hot Rolled Products [Member] | Tubular and Pipe Products [Member] |  |  |
Percentage of net sales | 0.00% | 0.00% | 0.00%
Plate Products [Member] |  |  |
Percentage of net sales | 12.90% | 13.30% | 10.40%
Plate Products [Member] | Carbon Flat Products [Member] |  |  |
Percentage of net sales | 12.90% | 0.00% | 0.00%
Plate Products [Member] | Specialty Metals Flat Products [Member] |  |  |
Percentage of net sales | 0.00% | 13.30% | 10.40%
Plate Products [Member] | Tubular and Pipe Products [Member] |  |  |
Percentage of net sales | 0.00% | 0.00% | 0.00%
Cold Rolled Products [Member] |  |  |
Percentage of net sales | 4.00% | 4.70% | 7.00%
Cold Rolled Products [Member] | Carbon Flat Products [Member] |  |  |
Percentage of net sales | 4.00% | 0.00% | 0.00%
Cold Rolled Products [Member] | Specialty Metals Flat Products [Member] |  |  |
Percentage of net sales | 0.00% | 4.70% | 7.00%
Cold Rolled Products [Member] | Tubular and Pipe Products [Member] |  |  |
Percentage of net sales | 0.00% | 0.00% | 0.00%
Coated Products [Member] |  |  |
Percentage of net sales | 10.30% | 4.50% | 7.70%
Coated Products [Member] | Carbon Flat Products [Member] |  |  |
Percentage of net sales | 10.30% | 0.00% | 0.00%
Coated Products [Member] | Specialty Metals Flat Products [Member] |  |  |
Percentage of net sales | 0.00% | 4.50% | 7.70%
Coated Products [Member] | Tubular and Pipe Products [Member] |  |  |
Percentage of net sales | 0.00% | 0.00% | 0.00%
Specialty [Member] |  |  |
Percentage of net sales | 26.30% | 30.30% | 25.30%
Specialty [Member] | Carbon Flat Products [Member] |  |  |
Percentage of net sales | 0.00% | 30.30% | 25.30%
Specialty [Member] | Specialty Metals Flat Products [Member] |  |  |
Percentage of net sales | 26.30% | 0.00% | 0.00%
Specialty [Member] | Tubular and Pipe Products [Member] |  |  |
Percentage of net sales | 0.00% | 0.00% | 0.00%
Pipe and Tube Products [Member] |  |  |
Percentage of net sales | 17.10% | 16.70% | 16.50%
Pipe and Tube Products [Member] | Carbon Flat Products [Member] |  |  |
Percentage of net sales | 0.00% | 0.00% | 0.00%
Pipe and Tube Products [Member] | Specialty Metals Flat Products [Member] |  |  |
Percentage of net sales | 0.00% | 0.00% | 0.00%
Pipe and Tube Products [Member] | Tubular and Pipe Products [Member] |  |  |
Percentage of net sales | 17.10% | 16.70% | 16.50%
Product and Service, Other [Member] |  |  |
Percentage of net sales | 0.60% | 0.70% | 1.70%
Product and Service, Other [Member] | Carbon Flat Products [Member] |  |  |
Percentage of net sales | 0.60% | 0.00% | 0.10%
Product and Service, Other [Member] | Specialty Metals Flat Products [Member] |  |  |
Percentage of net sales | 0.00% | 0.70% | 1.60%
Product and Service, Other [Member] | Tubular and Pipe Products [Member] |  |  |
Percentage of net sales | 0.00% | 0.00% | 0.00%

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