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Note 11 - Property, plant and equipment, net (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment, capitalized interest |  | $ 25.6 | $ 27.2 |
Percentage of ownership interest in subsidiary |  | 50.00% |  |
CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Companhia Siderúrgica Nacional [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment, pledged as security |  | $ 33.4 |  |
Saudi Arabia | Global Pipe Company [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment, pledged as security |  | $ 49.7 | $ 147.9 |
Saudi Arabia | SAUDI STEEL PIPE CO. and subsidiaries [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Percentage of ownership interest in subsidiary | [1] | 47.79% | 48.00% | 48.00%
Saudi Arabia | SAUDI STEEL PIPE CO. and subsidiaries [Member] | Global Pipe Company [Member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Proportion of ownership interest in joint venture |  | 57.30% |  |
[1] | All percentages rounded.

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