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Note 14 - Investments in non-consolidated companies (Details Textual) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2025 USD ($) $ / shares | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2025 R$ / shares | Feb. 13, 2019 USD ($)
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Total investments in subsidiaries, joint ventures and associates | $ 1,561,212 | $ 1,543,657 | $ 1,608,804 |  |
Gain (loss) recognised as result of remeasuring to fair value equity interest in acquiree held by acquirer before business combination |  |  |  |  |
Bargain purchase gain |  | 2,212 | $ 3,162 |  |
Dividends and distributions declared | $ 62,022 | 71,212 |  |  |
Proportion of ownership interest in subsidiary | 50.00% |  |  |  |
Techgen S.A. [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Total investments in subsidiaries, joint ventures and associates | $ 73,900 |  |  |  |
Ternium and Usiminas [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Dividends and distributions declared | $ 62,000 | $ 73,800 |  |  |
Usiminas [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Proportion of voting rights held in associate | 6.76% | 6.76% |  |  |
Fair value of investments in associates for which there are quoted market prices | $ 52,900 |  |  |  |
Total investments in subsidiaries, joint ventures and associates | 108,600 |  |  |  |
Loss Recognised Due to Particiaption Increase in Nonconsolidated Companies | $ 25,500 |  |  |  |
Proportion of ownership interest in subsidiary | 3.96% |  |  |  |
Usiminas [member] | Ordinary shares [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Closing price, per share (in BRL per share) | (per share) | $ 1.08 |  |  | R$ 5.96 |
Usiminas [member] | Preference shares [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Closing price, per share (in BRL per share) | (per share) | $ 1.08 |  |  | R$ 5.95 |
Ternium S.A. [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Proportion of voting rights held in associate | 11.70% | 11.70% |  |  |
Closing price, per ads (in dollars per share) | $ / shares | $ 38.19 |  |  |  |
Fair value of investments in associates for which there are quoted market prices | $ 877,300 |  |  |  |
Total investments in subsidiaries, joint ventures and associates | $ 1,375,100 |  |  |  |
Techgen S.A. [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Proportion of ownership interest in associate | 22.00% |  |  |  |
Exposure to transportation capacity agreements | $ 33,100 |  |  |  |
Exposure to the purchase of clean energy certificates | 16,100 |  |  |  |
Techgen S.A. [member] | Tenaris [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Loans and receivables | $ 68,800 |  |  |  |
Proportion of corporate guarantee covering obligations | 22.00% |  |  |  |
Techgen S.A. [member] | Several banks, to refinance obligations [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Debt instruments issued |  |  |  |  | $ 640,000
Techgen S.A. [member] | Tecpetrol International S.A. [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Proportion of ownership interest in associate | 30.00% |  |  |  |
Techgen S.A. [member] | Tenaris SA [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Debt service coverage ratio, covered, percent | 22.00% |  |  |  |
Letters of credit, covered | $ 9,700 |  |  |  |
Techgen S.A. [member] | Ternium S.A. [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Proportion of ownership interest in associate | 48.00% |  |  |  |
Techgen S.A. [member] | Ternium S.A. [member] | Tecpetrol International S.A. [member] | Tenaris [member] |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |
Loans and receivables | $ 312,700 |  |  |  |

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