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Note 8 - Equity in earnings of non-consolidated companies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of Equity in Earnings of Nonconsolidated Companies [Line Items] |  |  |
Earnings from non-consolidated companies | $ 58,038 | $ 8,548 |
Remeasurement of previously held interest |  |  |
Bargain purchase gain |  | 2,212 | $ 3,162
Equity in earnings of non-consolidated companies | 58,038 | 8,548 | 95,404
Net of Effect Participation Increase [Member] |  |  |
Disclosure of Equity in Earnings of Nonconsolidated Companies [Line Items] |  |  |
Earnings from non-consolidated companies | 58,038 | 8,548 | 104,897
Usiminas |  |  |
Disclosure of Equity in Earnings of Nonconsolidated Companies [Line Items] |  |  |
Net loss related to participation increase in Usiminas | (25,500) |  |
Usiminas | Effect Participation Increase [Member] |  |  |
Disclosure of Equity in Earnings of Nonconsolidated Companies [Line Items] |  |  |
Net loss related to participation increase in Usiminas |  |  | (25,486)
Global Pipe Company [Member] |  |  |
Disclosure of Equity in Earnings of Nonconsolidated Companies [Line Items] |  |  |
Remeasurement of previously held interest |  |  | 4,506
Bargain purchase gain |  |  | $ 11,487

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