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Note 6 - Financial Results | 12 Months Ended
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Dec. 31, 2017
Statement Line Items [Line Items] |
Disclosure of finance income (cost) [text block] |
6 |  | Financial results
(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 |
During 2015 Tenaris has derecognized all its fixed income financial instruments categorized as available for sale. (*)In 2017 and 2016 includes the negative impact from Euro appreciation against the U.S. dollar on Euro denominated intercompany liabilities in subsidiaries with functional currency U.S. Dollar, largely offset by an increase in currency translation adjustment reserve from an Italian subsidiary. (**) In 2016 includes the negative impact from Brazilian Real appreciation against the U.S. dollar on hedging instruments and of Cash and cash equivalent and Other investments denominated in U.S. dollar in subsidiaries which functional currency is the Brazilian real, partially offset by an increase in currency translation adjustment reserve from the Brazilian subsidiaries.

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