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Note 2 - Cost of Sales (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of Cost of Sales [Abstract] |
Disclosure of detailed information about cost of sales [text block] |
|  | Year ended December 31, |
(all amounts in thousands of U.S. dollars) |  | 2020 |  |  | 2019 |  |  | 2018 |
Inventories at the beginning of the year |  |  | 2,265,880 |  |  |  | 2,524,341 |  |  |  | 2,368,304 |
Increase in inventory due to business combinations |  |  | 199,589 |  |  |  | 52,966 |  |  |  | - |
Plus: Charges of the year |  |  |  |  |  |  |  |  |  |  |  |
Raw materials, energy, consumables and other |  |  | 1,545,688 |  |  |  | 2,709,629 |  |  |  | 3,400,396 |
Services and fees |  |  | 154,976 |  |  |  | 222,415 |  |  |  | 275,130 |
Labor cost (*) |  |  | 757,359 |  |  |  | 870,261 |  |  |  | 855,040 |
Depreciation of property, plant and equipment |  |  | 503,725 |  |  |  | 428,791 |  |  |  | 432,497 |
Amortization of intangible assets |  |  | 8,121 |  |  |  | 5,948 |  |  |  | 8,220 |
Depreciation of right-of-use assets |  |  | 40,127 |  |  |  | 28,727 |  |  |  | - |
Maintenance expenses |  |  | 107,764 |  |  |  | 284,758 |  |  |  | 185,782 |
Allowance for obsolescence |  |  | 35,809 |  |  |  | 29,138 |  |  |  | 25,457 |
Taxes |  |  | 45,162 |  |  |  | 100,738 |  |  |  | 133,308 |
Other |  |  | 59,790 |  |  |  | 115,663 |  |  |  | 119,507 |
|  |  | 3,458,110 |  |  |  | 4,849,034 |  |  |  | 5,435,337 |
Less: Inventories at the end of the year |  |  | (1,636,673 | ) |  |  | (2,265,880 | ) |  |  | (2,524,341 | )
|  |  | 4,087,317 |  |  |  | 5,107,495 |  |  |  | 5,279,300 |

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- References No definition available. + Details
Name: | ts_DisclosureOfCostOfSalesAbstract
Namespace Prefix: | ts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The disclosure of detailed information about cost of sales. + References No definition available. + Details
Name: | ts_DisclosureOfDetailedInformationAboutCostOfSalesTextBlock
Namespace Prefix: | ts_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration