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Note 7 - Income Tax (Tables)
 12 Months Ended
Dec. 31, 2019
Statement Line Items [Line Items]  
Disclosure of detailed information about income tax expense (benefit) [text block]
    Year ended December 31,  
(all amounts in thousands of U.S. dollars)   2019     2018     2017  
                   
Current tax    
299,692
      
343,104
      
184,016
  
Deferred tax    
(97,240
 )    
(113,897
 )    
(100,432
 )
     
202,452
      
229,207
      
83,584
  
From discontinued operations    
-
      
-
      
(100,720
 )
     
202,452
      
229,207
      
(17,136
 )
Disclosure of difference between income before tax and the theoretical amount that would arise using tax rate in each country [text block]
    Year ended December 31,  
(all amounts in thousands of U.S. dollars)   2019     2018     2017  
                   
Income before income tax    
933,710
      
1,103,107
      
427,711
  
                         
Tax calculated at the tax rate in each country    
186,752
      
207,422
      
6,456
  
Effect of currency translation on tax base    
53,296
      
77,552
      
(922
 )
Changes in the tax rates    
(13
 )    
1,824
      
(62,968
 )
Utilization of previously unrecognized tax losses    
(547
 )    
-
      
-
  
Tax revaluation, withholding tax and others    
(37,036
 )    
(57,591
 )    
40,298
  
Tax charge    
202,452
      
229,207
      
(17,136
 )