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Note 19 - Trade receivables, net - Summary of the Aging of Trade Receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Disclosure of financial assets that are either past due or impaired [line items] |  |
Guaranteed | $ 373,516 | $ 288,388
Not guaranteed | 1,606,911 | 1,667,244
Guaranteed and not guaranteed | $ 1,980,427 | $ 1,955,632
Expected loss rate | 0.02% | 0.03%
Allowance for doubtful accounts | $ (531) | $ (525)
Nominative allowance for doubtful accounts | (59,056) | (47,600)
Net Value | 1,920,840 | 1,907,507
Current trade receivables, not due [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Guaranteed | 344,711 | 254,777
Not guaranteed | 1,316,554 | 1,305,338
Guaranteed and not guaranteed | $ 1,661,265 | $ 1,560,115
Expected loss rate | 0.01% | 0.01%
Allowance for doubtful accounts | $ (147) | $ (147)
Nominative allowance for doubtful accounts |  |
Net Value | 1,661,118 | 1,559,968
Current trade receivables, past due, less than 180 days [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Guaranteed | 28,620 | 33,341
Not guaranteed | 207,080 | 298,988
Guaranteed and not guaranteed | $ 235,700 | $ 332,329
Expected loss rate | 0.04% | 0.09%
Allowance for doubtful accounts | $ (110) | $ (323)
Nominative allowance for doubtful accounts | (259) | (303)
Net Value | 235,331 | 331,703
Current trade receivables, past due, greater than 180 days [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Guaranteed | 185 | 270
Not guaranteed | 83,277 | 62,918
Guaranteed and not guaranteed | $ 83,462 | $ 63,188
Expected loss rate | 0.35% | 0.33%
Allowance for doubtful accounts | $ (274) | $ (55)
Nominative allowance for doubtful accounts | (58,797) | (47,297)
Net Value | $ 24,391 | $ 15,836

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- Definition The amount of current trade receivables. [Refer: Trade receivables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph B9 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B9_b&doctype=Appendix&subtype=B -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 68 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_68&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 78 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_78_b&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_CurrentTradeReceivables
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of allowance for doubtful accounts, net of nominative allowances. + References No definition available. + Details
Name: | ts_AllowanceForDoubtfulAccountsNetOfNominativeAllowances
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The expected loss rate of current trade receivables. + References No definition available. + Details
Name: | ts_CurrentTradeReceivablesExpectedLossRate
Namespace Prefix: | ts_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The gross amount of current trade receivables. + References No definition available. + Details
Name: | ts_CurrentTradeReceivablesGross
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the amount current trade receivables that are guaranteed. + References No definition available. + Details
Name: | ts_CurrentTradeReceivablesGuaranteed
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of nominative allowances for doubtful accounts from current trade receivables. + References No definition available. + Details
Name: | ts_CurrentTradeReceivablesNominativeAllowancesForDoubtfulAccounts
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the amount of current trade receivables that are not guaranteed. + References No definition available. + Details
Name: | ts_CurrentTradeReceivablesNotGuaranteed
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |