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Note 17 - Cash and Cash Equivalents and Other Investments (Tables) | 12 Months Ended
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Dec. 31, 2018
Statement Line Items [Line Items] |
Detailed disclosure of cash and cash equivalents and other investments [text block] |
|  | Year ended December 31,
|  | 2018 |  | 2017
Cash and cash equivalents |  |  |  |  |  |  |  |
Cash at banks |  |  | 81,211 |  |  |  | 150,948 |
Liquidity funds |  |  | 160,198 |  |  |  | 66,033 |
Short – term investments |  |  | 186,952 |  |  |  | 113,240 |
|  |  | 428,361 |  |  |  | 330,221 |
Other investments - current |  |  |  |  |  |  |  |
Fixed Income (time-deposit, zero coupon bonds, commercial papers) |  |  | 300,410 |  |  |  | 437,406 |
Bonds and other fixed Income |  |  | 187,324 |  |  |  | 754,800 |
Others |  |  | - |  |  |  | 100 |
|  |  | 487,734 |  |  |  | 1,192,306 |
Other investments - Non-current |  |  |  |  |  |  |  |
Bonds and other fixed Income |  |  | 113,829 |  |  |  | 123,498 |
Others |  |  | 4,326 |  |  |  | 4,837 |
|  |  | 118,155 |  |  |  | 128,335 |

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