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Note 2 - Cost of Sales
 12 Months Ended
Dec. 31, 2017
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)   2017     2016     2015  
             
Inventories at the beginning of the year    
1,563,889
      
1,843,467
      
2,779,869
  
                         
Plus: Charges of the year                        
Raw materials, energy, consumables and other    
2,794,503
      
1,528,532
      
1,934,209
  
Services and fees    
244,035
      
199,210
      
298,470
  
Labor cost    
778,408
      
658,975
      
947,997
  
Depreciation of property, plant and equipment    
383,490
      
376,965
      
377,596
  
Amortization of intangible assets    
18,621
      
27,244
      
24,100
  
Maintenance expenses    
183,370
      
122,553
      
184,053
  
Allowance for obsolescence    
(12,917
 )    
32,765
      
68,669
  
Taxes    
18,542
      
16,693
      
21,523
  
Other    
88,823
      
89,575
      
92,059
  
     
4,496,875
      
3,052,512
      
3,948,676
  
Less: Inventories at the end of the year (*)    
(2,368,304
 )    
(1,593,708
 )    
(1,843,467
 )
From discontinued operations    
(7,403
 )    
(136,587
 )    
(137,318
 )
     
3,685,057
      
3,165,684
      
4,747,760
  
 
(*) Inventories as of
December 31, 2016
include $
29.8
million related to discontinued operations.