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Note 2 - Cost of Sales
 12 Months Ended
Dec. 31, 2019
Statement Line Items [Line Items]  
Disclosure of cost of sales [text block]
2
 Cost of sales
    Year ended December 31,  
(all amounts in thousands of U.S. dollars)   2019     2018     2017  
                   
Inventories at the beginning of the year    
2,524,341
      
2,368,304
      
1,563,889
  
Increase in inventory due to business combinations    
52,966
      
-
      
-
  
Plus: Charges of the year                        
Raw materials, energy, consumables and other    
2,709,629
      
3,400,396
      
2,794,503
  
Services and fees    
222,415
      
275,130
      
244,035
  
Labor cost    
870,261
      
855,040
      
778,408
  
Depreciation of property, plant and equipment    
428,791
      
432,497
      
383,490
  
Amortization of intangible assets    
5,948
      
8,220
      
18,621
  
Depreciation of right-of-use assets    
28,727
      
-
      
-
  
Maintenance expenses    
284,758
      
185,782
      
183,370
  
Allowance for obsolescence    
29,138
      
25,457
      
(12,917
 )
Taxes    
100,738
      
133,308
      
18,542
  
Other    
115,663
      
119,507
      
88,823
  
     
4,849,034
      
5,435,337
      
4,496,875
  
Less: Inventories at the end of the year    
(2,265,880
 )    
(2,524,341
 )    
(2,368,304
 )
From discontinued operations    
-
      
-
      
(7,403
 )
     
5,107,495
      
5,279,300
      
3,685,057