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Note 17 - Trade Receivables, Net - Summary of the Aging of Trade Receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Statement Line Items [Line Items] |  |  |
Guaranteed | $ 234,427 | $ 286,250 |
Not guaranteed | 1,162,515 | 1,517,651 |
Guaranteed and not guaranteed | $ 1,396,942 | $ 1,803,901 |
Expected loss rate | 0.09% | 0.07% |
Allowances for doubtful accounts | $ (1,294) | $ (1,396) |
Nominative allowances for doubtful accounts | (47,488) | (65,139) |
Net Value | 1,348,160 | 1,737,366 | $ 1,214,060
Current trade receivables, not due [member] |  |  |
Statement Line Items [Line Items] |  |  |
Guaranteed | 205,764 | 254,743 |
Not guaranteed | 948,449 | 1,180,788 |
Guaranteed and not guaranteed | $ 1,154,213 | $ 1,435,531 |
Expected loss rate | 0.04% | 0.04% |
Allowances for doubtful accounts | $ (529) | $ (564) |
Nominative allowances for doubtful accounts |  |  |
Net Value | 1,153,684 | 1,434,967 |
Current trade receivables, past due, less than 180 days [member] |  |  |
Statement Line Items [Line Items] |  |  |
Guaranteed | 26,899 | 30,884 |
Not guaranteed | 157,960 | 260,675 |
Guaranteed and not guaranteed | $ 184,859 | $ 291,559 |
Expected loss rate | 0.24% | 0.17% |
Allowances for doubtful accounts | $ (455) | $ (510) |
Nominative allowances for doubtful accounts | (1,922) | (1,436) |
Net Value | 182,482 | 289,613 |
Current trade receivables, past due, greater than 180 days [member] |  |  |
Statement Line Items [Line Items] |  |  |
Guaranteed | 1,764 | 623 |
Not guaranteed | 56,106 | 76,188 |
Guaranteed and not guaranteed | $ 57,870 | $ 76,811 |
Expected loss rate | 0.57% | 0.43% |
Allowances for doubtful accounts | $ (310) | $ (322) |
Nominative allowances for doubtful accounts | (45,566) | (63,703) |
Net Value | $ 11,994 | $ 12,786 |

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- Definition The amount of current trade receivables. [Refer: Trade receivables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 68 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_68&doctype=Standard -URIDate 2019-03-27 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition The amount of allowance for doubtful accounts, net of nominative allowances. + 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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- Definition The expected loss rate of current trade receivables. + References No definition available. + Details
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Namespace Prefix: | ts_
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Balance Type: | na
Period Type: | instant

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- Definition The gross amount of current trade receivables. + References No definition available. + Details
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Namespace Prefix: | ts_
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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
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Namespace Prefix: | ts_
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Balance Type: | debit
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- Definition The amount of nominative allowances for doubtful accounts from current trade receivables. + References No definition available. + Details
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Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Represents the amount of current trade receivables that are not guaranteed. + References No definition available. + Details
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Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
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- References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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