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Note 39 - The COVID-19 pandemic and the oil & gas crisis and their impact on Tenaris's operations and financial condition (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 25, 2020 | Nov. 04, 2020 | Nov. 20, 2019 | May 22, 2019 | Nov. 21, 2018 | May 23, 2018 | Nov. 22, 2017 | Nov. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Unusual or Infrequent Item 1 [line items] |  |  |  |  |  |  |  |  |  |  |
Dividends recognised as distributions to owners | $ 82,600 |  | $ 153,000 | $ 484,000 |  | $ 484,000 |  | $ 153,000 | $ 87,938 | $ 485,827 | $ 487,681
Dividends paid, ordinary shares per share (in dollars per share) | $ 0.07 | $ 0.07 |  | $ 0.28 | $ 0.13 | $ 0.28 | $ 0.13 |  |  |  |
Dividends paid, per American Depositary Security (in dollars per share) |  | $ 0.14 |  |  |  |  |  |  |  |  |
Global pandemic [member] |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item 1 [line items] |  |  |  |  |  |  |  |  |  |  |
Estimated annual savings from the reduction of fixed costs |  |  |  |  |  |  |  |  | 230,000 |  |
Reduction of capital expenditures and research and development expenses |  |  |  |  |  |  |  |  | 157,000 |  |
Net cash position [member] |  |  |  |  |  |  |  |  |  |  |
Unusual or Infrequent Item 1 [line items] |  |  |  |  |  |  |  |  |  |  |
Total cash |  |  |  |  |  |  |  |  | $ 1,085,000 |  |

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