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Note 10 - Intangible Assets, Net (Tables) | 12 Months Ended
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Dec. 31, 2019
Statement Line Items [Line Items] |
Disclosure of reconciliation of changes in intangible assets and goodwill [text block] |
Year ended December 31, 2019 |  | Information system projects |  | Licenses, patents and trademarks (*) |  | Goodwill |  | Customer relationships |  | Total
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Values at the beginning of the year |  |  | 580,622 |  |  |  | 464,571 |  |  |  | 2,085,936 |  |  |  | 2,058,859 |  |  |  | 5,189,988 |
Translation differences |  |  | (1,917 | ) |  |  | (70 | ) |  |  | (968 | ) |  |  | - |  |  |  | (2,955 | )
Increase due to business combinations (**) |  |  | 405 |  |  |  | - |  |  |  | 32,869 |  |  |  | 81,192 |  |  |  | 114,466 |
Additions |  |  | 35,487 |  |  |  | 772 |  |  |  | - |  |  |  | - |  |  |  | 36,259 |
Transfers / Reclassifications |  |  | (4,665 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (4,665 | )
Disposals |  |  | (5,062 | ) |  |  | (1,531 | ) |  |  | - |  |  |  | - |  |  |  | (6,593 | )
Values at the end of the year |  |  | 604,870 |  |  |  | 463,742 |  |  |  | 2,117,837 |  |  |  | 2,140,051 |  |  |  | 5,326,500 |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated at the beginning of the year |  |  | 513,984 |  |  |  | 373,466 |  |  |  | 797,592 |  |  |  | 2,038,981 |  |  |  | 3,724,023 |
Translation differences |  |  | (1,734 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (1,734 | )
Amortization charge |  |  | 28,937 |  |  |  | 719 |  |  |  | - |  |  |  | 18,259 |  |  |  | 47,915 |
Disposals |  |  | (4,850 | ) |  |  | (413 | ) |  |  | - |  |  |  | - |  |  |  | (5,263 | )
Accumulated at the end of the year |  |  | 536,337 |  |  |  | 373,772 |  |  |  | 797,592 |  |  |  | 2,057,240 |  |  |  | 3,764,941 |
At December 31, 2019 |  |  | 68,533 |  |  |  | 89,970 |  |  |  | 1,320,245 |  |  |  | 82,811 |  |  |  | 1,561,559 |
Year ended December 31, 2018 |  | Information system projects |  | Licenses, patents and trademarks (*) |  | Goodwill |  | Customer relationships |  | Total
Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Values at the beginning of the year |  |  | 560,692 |  |  |  | 465,963 |  |  |  | 2,090,073 |  |  |  | 2,058,859 |  |  |  | 5,175,587 |
Translation differences |  |  | (6,153 | ) |  |  | (183 | ) |  |  | (4,137 | ) |  |  | - |  |  |  | (10,473 | )
Additions |  |  | 31,632 |  |  |  | 273 |  |  |  | - |  |  |  | - |  |  |  | 31,905 |
Transfers / Reclassifications |  |  | (5,493 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (5,493 | )
Disposals |  |  | (56 | ) |  |  | (1,482 | ) |  |  | - |  |  |  | - |  |  |  | (1,538 | )
Values at the end of the year |  |  | 580,622 |  |  |  | 464,571 |  |  |  | 2,085,936 |  |  |  | 2,058,859 |  |  |  | 5,189,988 |
Amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated at the beginning of the year |  |  | 478,946 |  |  |  | 372,746 |  |  |  | 797,592 |  |  |  | 1,865,444 |  |  |  | 3,514,728 |
Translation differences |  |  | (5,551 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (5,551 | )
Amortization charge |  |  | 40,635 |  |  |  | 720 |  |  |  | - |  |  |  | 173,537 |  |  |  | 214,892 |
Disposals |  |  | (46 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (46 | )
Accumulated at the end of the year |  |  | 513,984 |  |  |  | 373,466 |  |  |  | 797,592 |  |  |  | 2,038,981 |  |  |  | 3,724,023 |
At December 31, 2018 |  |  | 66,638 |  |  |  | 91,105 |  |  |  | 1,288,344 |  |  |  | 19,878 |  |  |  | 1,465,965 |
Disclosure of information for cash-generating units [text block] |
(All amounts in million US dollar) |  |  |  |  |  |  |  |
As of December 31, 2019 |  | Tubes Segment |  | Other Segment |  |
CGU |  | Maverick Acquisition |  | Hydril Acquisition |  | Other |  | Maverick Acquisition |  | Total
OCTG (USA) |  |  | 225 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 225 |
Tamsa (Hydril and other) |  |  | - |  |  |  | 346 |  |  |  | 19 |  |  |  | - |  |  |  | 365 |
Siderca (Hydril and other) |  |  | - |  |  |  | 265 |  |  |  | 93 |  |  |  | - |  |  |  | 358 |
Hydril |  |  | - |  |  |  | 309 |  |  |  | - |  |  |  | - |  |  |  | 309 |
Confab |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Coiled Tubing |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 4 |  |  |  | 4 |
Other |  |  | - |  |  |  | - |  |  |  | 59 |  |  |  | - |  |  |  | 59 |
Total |  |  | 225 |  |  |  | 920 |  |  |  | 171 |  |  |  | 4 |  |  |  | 1,320 |

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