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Note 19 - Deferred Income Tax - Recovery Analysis of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Deferred tax assets to be recovered after 12 months $ (181,606) $ (153,532)
Deferred tax liabilities to be recovered after 12 months 379,039 457,970
Later than one year [member]    
Statement Line Items [Line Items]    
Deferred tax assets to be recovered after 12 months (452,330) (405,416)
Deferred tax liabilities to be recovered after 12 months $ 739,670 $ 808,108