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Note 20 - Deferred Income Tax - Recovery Analysis of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement Line Items [Line Items]    
Deferred tax assets to be recovered after 12 months $ (225,680) $ (181,606)
Deferred tax liabilities to be settled after 12 months 336,982 379,039
Later than one year [member]    
Statement Line Items [Line Items]    
Deferred tax assets to be recovered after 12 months (538,274) (452,330)
Deferred tax liabilities to be settled after 12 months $ 766,852 $ 739,670