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Note 30 - Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2019
Statement Line Items [Line Items]  
Disclosure of transactions between related parties [text block]
  (all amounts in thousands of U.S. dollars)   Year ended December 31,
      2019   2018   2017
(i)
 Transactions        
  (a) Sales of goods and services            
  Sales of goods to non-consolidated parties    
20,577
      
23,709
      
32,362
  
  Sales of goods to other related parties    
69,972
      
131,548
      
94,624
  
  Sales of services to non-consolidated parties    
5,620
      
7,641
      
11,637
  
  Sales of services to other related parties    
4,386
      
5,647
      
3,751
  
       
100,555
      
168,545
      
142,374
  
  (b) Purchases of goods and services                        
  Purchases of goods to non-consolidated parties    
174,588
      
245,186
      
234,361
  
  Purchases of goods to other related parties    
51,765
      
106,624
      
17,711
  
  Purchases of services to non-consolidated parties    
9,404
      
9,556
      
12,077
  
  Purchases of services to other related parties    
54,514
      
46,179
      
50,794
  
       
290,271
      
407,545
      
314,943
  
  (all amounts in thousands of U.S. dollars)   At December 31,
      2019   2018
(ii)
 Period-end balances        
  (a) Arising from sales / purchases of goods / services        
  Receivables from non-consolidated parties    
78,884
      
122,136
  
  Receivables from other related parties    
10,400
      
24,419
  
  Payables to non-consolidated parties    
(19,100
 )    
(33,197
 )
  Payables to other related parties    
(7,048
 )    
(17,595
 )
       
63,136
      
95,763
  
                   
  (b) Financial debt                
  Finance lease liabilities from non-consolidated parties    
(2,064
 )    
-
  
       
(2,064
 )    
-