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Note 14 - Investments in non-consolidated companies - Principal Non-consolidated Companies (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2021
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  | 50.00% |
Value |  | $ 1,608,804 | $ 1,540,646 | $ 1,608,804 | $ 1,383,774
Ternium S.A. [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Percentage of ownership |  |  |  | 11.46% |
Value |  | $ 1,430,600 |  | $ 1,430,600 |
Ternium S.A. [member] | LUXEMBOURG |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Percentage of ownership | [1] | 11.46% | 11.46% |  |
Value | [1] | $ 1,430,616 | $ 1,363,607 | $ 1,430,616 |
Usiminas [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Percentage of ownership |  |  |  | 3.96% |
Value |  | $ 123,700 |  | $ 123,700 |
Usiminas [member] | Brazil |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Percentage of ownership | [2] | 3.96% | 3.07% |  |
Value | [2] | $ 123,654 | $ 109,534 | $ 123,654 |
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 |  | $ 53,556 | $ 41,506 | $ 53,556 |
Global Pipe Company [Member] | Saudi Arabia |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Percentage of ownership | [3] |  | 35.00% |  |
Proportion of ownership interest in subsidiary | [3] | 57.30% |  |  |
Value | [3] |  | $ 23,022 |  |
Other [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Value |  | $ 978 | $ 2,977 | $ 978 |
[1] | Including treasury shares.
[2] | At December 31, 2023 the voting rights were 6.76% and at December 31, 2022 were 5.19%.
[3] | Consolidated as from May 17, 2023.

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