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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 |

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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
Name: | ifrs-full_DisclosureOfOtherProvisionsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of adjustments for litigation provision related to acquisition to reconcile profit (loss) to net cash flow from (used in) operating activities. + References No definition available. + Details
Name: | ts_AdjustmentsForLitigationProvisionRelatedToAcquisition
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=ts_UsiminasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |