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Note 18 - Cash and Cash Equivalents and Other Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Statement Line Items [Line Items] |
Detailed disclosure of cash and cash equivalents and other investments [text block] |
|  | Year ended December 31, |
|  | 2017 |  |  | 2016 |
Cash and cash equivalents |  |  |  |  |  |  |  |
Cash at banks |  |  | 150,948 |  |  |  | 92,730 |
Liquidity funds |  |  | 66,033 |  |  |  | 215,807 |
Short – term investments |  |  | 113,240 |  |  |  | 91,200 |
|  |  | 330,221 |  |  |  | 399,737 |
Other investments - current |  |  |  |  |  |  |  |
Fixed Income (time-deposit, zero coupon bonds, commercial papers) |  |  | 437,406 |  |  |  | 782,029 |
Bonds and other fixed Income |  |  | 754,800 |  |  |  | 841,638 |
Fund Investments |  |  | - |  |  |  | 9,475 |
Others |  |  | 100 |  |  |  | - |
|  |  | 1,192,306 |  |  |  | 1,633,142 |
Other investments - Non-current |  |  |  |  |  |  |  |
Bonds and other fixed Income |  |  | 123,498 |  |  |  | 248,049 |
Others |  |  | 4,837 |  |  |  | 1,670 |
|  |  | 128,335 |  |  |  | 249,719 |

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