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Note 6 - Financial Results (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of detailed information about financial income (cost) [text block]
(all amounts in thousands of U.S. dollars)   Year ended December 31,  
    2017     2016     2015  
             
Interest Income    
51,525
      
60,405
      
39,516
  
Net result on changes in FV of financial assets at FVTPL    
(3,920
 )    
5,799
      
(4,942
 )
Finance income    
47,605
      
66,204
      
34,574
  
Finance cost    
(27,072
 )    
(22,329
 )    
(23,058
 )
Net foreign exchange transactions results (*)    
(48,955
 )    
(2,146
 )    
(13,301
 )
Foreign exchange derivatives contracts results (**)    
(8,996
 )    
(31,310
 )    
30,468
  
Other    
14,392
      
11,447
      
(14,473
 )
Other financial results    
(43,559
 )    
(22,009
 )    
2,694
  
Net financial results    
(23,026
 )    
21,866
      
14,210
  
From discontinued operations    
9
      
88
      
382
  
     
(23,017
 )    
21,954
      
14,592