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Note 3 - Revenue Recognition - Disaggregation of Revenues, Percentage (Details) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Percentage of net sales | 100.00% | 100.00%
Hot Rolled Products [Member] |  |
Percentage of net sales | 29.70% | 32.30%
Plate Products [Member] |  |
Percentage of net sales | 9.60% | 12.20%
Cold Rolled Products [Member] |  |
Percentage of net sales | 5.90% | 5.50%
Coated Products [Member] |  |
Percentage of net sales | 9.60% | 7.70%
Specialty [Member] |  |
Percentage of net sales | 23.50% | 20.90%
Pipe and Tube Products [Member] |  |
Percentage of net sales | 18.70% | 18.30%
Product and Service, Other [Member] |  |
Percentage of net sales | 3.00% | 3.10%
Carbon Flat Products [Member] |  |
Percentage of net sales | 55.90% | 58.70%
Carbon Flat Products [Member] | Hot Rolled Products [Member] |  |
Percentage of net sales | 29.70% | 32.30%
Carbon Flat Products [Member] | Plate Products [Member] |  |
Percentage of net sales | 9.60% | 12.20%
Carbon Flat Products [Member] | Cold Rolled Products [Member] |  |
Percentage of net sales | 5.90% | 5.50%
Carbon Flat Products [Member] | Coated Products [Member] |  |
Percentage of net sales | 9.60% | 7.70%
Carbon Flat Products [Member] | Specialty [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Carbon Flat Products [Member] | Pipe and Tube Products [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Carbon Flat Products [Member] | Product and Service, Other [Member] |  |
Percentage of net sales | 1.10% | 1.00%
Specialty Metals Flat Products [Member] |  |
Percentage of net sales | 25.40% | 23.00%
Specialty Metals Flat Products [Member] | Hot Rolled Products [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Specialty Metals Flat Products [Member] | Plate Products [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Specialty Metals Flat Products [Member] | Cold Rolled Products [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Specialty Metals Flat Products [Member] | Coated Products [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Specialty Metals Flat Products [Member] | Specialty [Member] |  |
Percentage of net sales | 23.50% | 20.90%
Specialty Metals Flat Products [Member] | Pipe and Tube Products [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Specialty Metals Flat Products [Member] | Product and Service, Other [Member] |  |
Percentage of net sales | 1.90% | 2.10%
Tubular and Pipe Products [Member] |  |
Percentage of net sales | 18.70% | 18.30%
Tubular and Pipe Products [Member] | Hot Rolled Products [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Tubular and Pipe Products [Member] | Plate Products [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Tubular and Pipe Products [Member] | Cold Rolled Products [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Tubular and Pipe Products [Member] | Coated Products [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Tubular and Pipe Products [Member] | Specialty [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Tubular and Pipe Products [Member] | Pipe and Tube Products [Member] |  |
Percentage of net sales | 18.70% | 18.30%
Tubular and Pipe Products [Member] | Product and Service, Other [Member] |  |
Percentage of net sales | 0.00% | 0.00%

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- Definition Percentage of revenue, including tax collected from customer, from satisfaction of performance obligation by transferring promised good or service to customer. + References No definition available. + Details
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