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Note 8 - Income Tax (Tables)
 12 Months Ended
Dec. 31, 2017
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)   2017     2016     2015  
                   
Current tax    
184,016
      
174,410
      
164,562
  
Deferred tax    
(100,432
 )    
(132,969
 )    
79,943
  
     
83,584
      
41,441
      
244,505
  
From discontinued operations    
(100,720
 )    
(24,339
 )    
(10,121
 )
     
(17,136
 )    
17,102
      
234,384
  
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)   2017     2016     2015  
                   
Income before income tax    
427,711
      
34,430
      
140,829
  
                         
Tax calculated at the tax rate in each country (*)    
6,456
      
(91,628
 )    
(71,588
 )
Non taxable income / Non deductible expenses, net (*)    
40,298
      
51,062
      
149,632
  
Changes in the tax rates    
(62,968
 )    
4,720
      
6,436
  
Effect of currency translation on tax base (**)    
(922
 )    
105,758
      
151,615
  
Accrual / Utilization of previously unrecognized tax losses (***)    
-
      
(52,810
 )    
(1,711
 )
Tax charge    
(17,136
 )    
17,102
      
234,384