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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