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Note 15 - Current Tax Assets and Liabilities - Summary of Current Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Statement Line Items [Line Items] |  |
V.A.T. credits | $ 67,322 | $ 76,714
Prepaid taxes | 54,010 | 55,620
| $ 121,332 | $ 132,334

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