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Note 23 - Derivative Financial Instruments - Net Fair Values (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Statement Line Items [Line Items] |  |
Derivatives with positive fair values | $ 9,225 | $ 8,230
Derivatives with negative fair values | (11,978) | (39,799)
Total | (2,753) | (31,569)
Derivatives hedging borrowings and investments [member] |  |
Statement Line Items [Line Items] |  |
Derivatives with positive fair values | 5,604 | 2,036
Derivatives with negative fair values | (11,667) | (34,770)
Other derivatives [member] |  |
Statement Line Items [Line Items] |  |
Derivatives with positive fair values | 3,621 | 6,194
Derivatives with negative fair values | $ (311) | $ (5,029)

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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 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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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 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of financial assets (liabilities) classified as derivative instruments. + References No definition available. + Details
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Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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