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Note 6 - Financial Results (Tables) | 12 Months Ended
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Dec. 31, 2017
Statement Line Items [Line Items] |
Disclosure of detailed information about financial income (cost) [text block] |
(all amounts in thousands of U.S. dollars) |  | Year ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Interest Income |  |  | 51,525 |  |  |  | 60,405 |  |  |  | 39,516 |
Net result on changes in FV of financial assets at FVTPL |  |  | (3,920 | ) |  |  | 5,799 |  |  |  | (4,942 | )
Finance income |  |  | 47,605 |  |  |  | 66,204 |  |  |  | 34,574 |
Finance cost |  |  | (27,072 | ) |  |  | (22,329 | ) |  |  | (23,058 | )
Net foreign exchange transactions results (*) |  |  | (48,955 | ) |  |  | (2,146 | ) |  |  | (13,301 | )
Foreign exchange derivatives contracts results (**) |  |  | (8,996 | ) |  |  | (31,310 | ) |  |  | 30,468 |
Other |  |  | 14,392 |  |  |  | 11,447 |  |  |  | (14,473 | )
Other financial results |  |  | (43,559 | ) |  |  | (22,009 | ) |  |  | 2,694 |
Net financial results |  |  | (23,026 | ) |  |  | 21,866 |  |  |  | 14,210 |
From discontinued operations |  |  | 9 |  |  |  | 88 |  |  |  | 382 |
|  |  | (23,017 | ) |  |  | 21,954 |  |  |  | 14,592 |

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