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Note 7 - Income Tax (Tables)
 12 Months Ended
Dec. 31, 2018
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)   2018     2017     2016  
                   
Current tax    
343,104
      
184,016
      
174,410
  
Deferred tax    
(113,897
 )    
(100,432
 )    
(132,969
 )
     
229,207
      
83,584
      
41,441
  
From discontinued operations    
-
      
(100,720
 )    
(24,339
 )
     
229,207
      
(17,136
 )    
17,102
  
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)   2018     2017     2016  
                   
Income before income tax    
1,103,107
      
427,711
      
34,430
  
                         
Tax calculated at the tax rate in each country    
207,422
      
6,456
      
(91,628
 )
Non taxable income / Non deductible expenses, net    
(57,591
 )    
40,298
      
51,062
  
Changes in the tax rates    
1,824
      
(62,968
 )    
4,720
  
Effect of currency translation on tax base (*)    
77,552
      
(922
 )    
105,758
  
Accrual / Utilization of previously unrecognized tax losses    
-
      
-
      
(52,810
 )
Tax charge    
229,207
      
(17,136
 )    
17,102