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Note 2 - Revenue Recognition - Disaggregation of Revenues, Percentage (Details) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Percentage of net sales | 100.00% | 100.00%
Hot Rolled Products [Member] |  |
Percentage of net sales | 28.10% | 30.00%
Plate Products [Member] |  |
Percentage of net sales | 8.70% | 11.60%
Cold Rolled Products [Member] |  |
Percentage of net sales | 6.20% | 5.60%
Coated Products [Member] |  |
Percentage of net sales | 8.80% | 8.60%
Specialty [Member] |  |
Percentage of net sales | 25.60% | 25.00%
Tube Products [Member] |  |
Percentage of net sales | 19.50% | 17.80%
Product and Service, Other [Member] |  |
Percentage of net sales | 3.10% | 1.40%
Carbon Flat Products [Member] |  |
Percentage of net sales | 53.20% | 57.20%
Carbon Flat Products [Member] | Hot Rolled Products [Member] |  |
Percentage of net sales | 28.10% | 30.00%
Carbon Flat Products [Member] | Plate Products [Member] |  |
Percentage of net sales | 8.70% | 11.60%
Carbon Flat Products [Member] | Cold Rolled Products [Member] |  |
Percentage of net sales | 6.20% | 5.60%
Carbon Flat Products [Member] | Coated Products [Member] |  |
Percentage of net sales | 8.80% | 8.60%
Carbon Flat Products [Member] | Specialty [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Carbon Flat Products [Member] | Tube Products [Member] |  |
Percentage of net sales | 0.00% | 0.00%
Carbon Flat Products [Member] | Product and Service, Other [Member] |  |
Percentage of net sales | 1.40% | 1.40%
Specialty Metals Flat Products [Member] |  |
Percentage of net sales | 27.30% | 25.00%
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 | 25.60% | 25.00%
Specialty Metals Flat Products [Member] | 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 | 1.70% | 0.00%
Tubular and Pipe Products [Member] |  |
Percentage of net sales | 19.50% | 17.80%
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] | Tube Products [Member] |  |
Percentage of net sales | 19.50% | 17.80%
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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