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Note 31 - Related party transactions (Details Textual) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 17, 2025 | Dec. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Sep. 17, 2025 | May 06, 2025
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Total number of shares issued (in shares) |  | 1,071,994,930 | 1,071,994,930 | 1,162,757,528 | 1,180,536,830 |  | 1,162,757,528
Key management personnel compensation, short-term employee benefits |  |  | $ 44.7 | $ 33.4 | $ 47.5 |  |
Key management personnel compensation, other long-term employee benefits |  |  | $ 6.7 | $ 6.9 | $ 5.6 |  |
Techint Holdings S.àr.l. [Member] | Bottom of range [member] |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  |  |  |  | 67.00% |
San Faustin S.A. [member] |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Percent of company voting capital |  | 70.07% | 70.07% |  |  |  |
Total number of shares issued (in shares) |  | 708,945,896 | 708,945,896 |  |  |  |
Proportion of ownership interest in associate |  | 66.13% | 66.13% |  |  |  |
Techint Holdings S.àr.l. [Member] | Tenaris SA [member] |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Number of ordinary shares sale |  | 4,819,291 |  |  |  |  |
Number of ordinary shares sale settled |  | 4,659,291 |  |  |  |  |
Shares disposal program number of ordinary shares sale | 2,600,000 |  |  |  |  |  |
Techint Holdings S.àr.l. [Member] | Tenaris SA [member] | Top of range [member] | Major ordinary share transactions [member] |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Shares disposal program number of ordinary shares sale | 21,000,000 |  |  |  |  |  |
Key management personnel of entity or parent [member] |  |  |  |  |  |  |
Disclosure of transactions between related parties [line items] |  |  |  |  |  |  |
Percent of company voting capital |  | 0.09% | 0.09% |  |  |  |
Proportion of ownership interest in associate |  | 0.08% | 0.08% |  |  |  |
Units issued, related party transactions (in shares) |  |  | 408,000 | 448,000 | 388,000 |  |

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