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Note 25 - Derivative Financial Instruments - Net Fair Values (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of information about credit exposures designated as measured at fair value through profit or loss [line items] |  |
Derivatives with positive fair values | $ 11,449 | $ 19,929
Derivatives with negative fair values | (3,217) | (1,814)
Total | 8,232 | 18,115
Derivatives hedging borrowings and investments [member] |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [line items] |  |
Derivatives with positive fair values | 10,119 | 19,000
Derivatives with negative fair values | (2,250) |
Other derivatives [member] |  |
Disclosure of information about credit exposures designated as measured at fair value through profit or loss [line items] |  |
Derivatives with positive fair values | 1,330 | 929
Derivatives with negative fair values | $ (967) | $ (1,814)

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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_DerivativeFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_DerivativeFinancialLiabilities
Namespace Prefix: | ifrs-full_
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 domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of financial assets (liabilities) classified as derivative instruments. + References No definition available. + Details
Name: | ts_DerivativeFinancialAssetsLiabilities
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: |
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- Details
Name: | ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskAxis=ts_OtherDerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |