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Note 21 - Borrowings - Maturity of Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 305,722 | $ 437,398 | $ 583,437
Interest to be accrued (*) | 3,679 | 6,942 |
Total | 309,401 | 444,340 |
Not later than one year [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | 305,354 | 425,999 |
Interest to be accrued (*) | 3,640 | 6,270 |
Total | 308,994 | 432,269 |
Later than one year and not later than two years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings |  | 11,399 |
Interest to be accrued (*) | 15 | 672 |
Total | 15 | 12,071 |
Later than two years and not later than three years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | 92 |  |
Interest to be accrued (*) | 11 |  |
Total | 103 |  |
Later than three years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | 276 |  |
Interest to be accrued (*) | 13 |  |
Total | 289 |  |
Other borrowings [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | 305,722 | 437,398 |
Other borrowings [member] | Not later than one year [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | 305,354 | 425,999 |
Other borrowings [member] | Later than one year and not later than two years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings |  | 11,399 |
Other borrowings [member] | Later than two years and not later than three years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | 92 |  |
Other borrowings [member] | Later than three years [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Total borrowings | $ 276 |  |

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The amount of interest recognised as a liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of borrowings including interest to be accrued. + References No definition available. + Details
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Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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