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Note 14 - Investments in non-consolidated companies - Principal Non-consolidated Companies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of unconsolidated structured entities [line items] |  |  |
Value | $ 1,561,212 | $ 1,543,657 | $ 1,608,804
Proportion of ownership interest in subsidiary | 50.00% |  |
Ternium S.A. [member] |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Value | $ 1,375,100 |  |
Ternium S.A. [member] | LUXEMBOURG |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Percentage of ownership | 11.46% | 11.46% |
Value | $ 1,375,115 | $ 1,377,911 |
Usiminas [member] |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Value | $ 108,600 |  |
Proportion of ownership interest in subsidiary | 3.96% |  |
Usiminas [member] | Brazil |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Percentage of ownership | 3.96% | 3.96% |
Value | $ 108,574 | $ 102,812 |
Techgen S.A. [member] |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Percentage of ownership | 22.00% |  |
Techgen S.A. [member] | Mexico |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Percentage of ownership | 22.00% | 22.00% |
Value | $ 73,936 | $ 59,782 |
Other [member] |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |
Value | $ 3,587 | $ 3,152 |

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