Note 21 - Borrowings - Significant Borrowings as of Closing Date (Details) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Disclosure of detailed information about borrowings [line items] | |||
| Significant borrowings as of closing date | $ 305,722 | $ 437,398 | $ 583,437 |
| Significant borrowings as of closing date [member] | Tubos De Acero De Mexico, SA [Member] | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Significant borrowings as of closing date | 150,000 | ||
| Significant borrowings as of closing date [member] | TENARIS TUBOCARIBE Ltda. [Member] | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Significant borrowings as of closing date | 30,000 | ||
| Significant borrowings one, as of closing date [member] | Tubos De Acero De Mexico, SA [Member] | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Significant borrowings as of closing date | $ 50,000 |