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Note 28 - Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2018
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,
    2018   2017   2016
(i) Transactions                  
(a) Sales of goods and services            
Sales of goods to non-consolidated parties    
23,709
      
32,362
      
21,174
  
Sales of goods to other related parties    
131,548
      
94,624
      
32,613
  
Sales of services to non-consolidated parties    
7,641
      
11,637
      
9,542
  
Sales of services to other related parties    
5,647
      
3,751
      
2,948
  
     
168,545
      
142,374
      
66,277
  
(b) Purchases of goods and services                        
Purchases of goods to non-consolidated parties    
245,186
      
234,361
      
67,048
  
Purchases of goods to other related parties    
106,624
      
17,711
      
20,150
  
Purchases of services to non-consolidated parties    
9,556
      
12,077
      
11,528
  
Purchases of services to other related parties    
46,179
      
50,794
      
53,530
  
     
407,545
      
314,943
      
152,256
  
(all amounts in thousands of U.S. dollars)   At December 31,
    2018   2017
(ii) Period-end balances        
(a) Arising from sales / purchases of goods / services        
Receivables from non-consolidated parties    
122,135
      
117,853
  
Receivables from other related parties    
24,419
      
50,815
  
Payables to non-consolidated parties    
(33,197
 )    
(49,354
 )
Payables to other related parties    
(17,595
 )    
(14,475
 )
     
95,762
      
104,839