Note 25 - Current allowances and provisions - (Details Textual) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of other provisions [line items] | |||
| Provision for the ongoing litigation related to the acquisition of participation in Usiminas | $ 25,579 | $ 89,371 | |
| Usiminas [member] | |||
| Disclosure of other provisions [line items] | |||
| Provision for the ongoing litigation related to the acquisition of participation in Usiminas | $ 114,900 | $ 89,400 | |