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Note 13 - Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of detailed information about inventories [text block]
    Year ended December 31,
    2018   2017
Finished goods    
1,025,999
      
923,316
  
Goods in process    
709,497
      
619,796
  
Raw materials    
256,816
      
281,083
  
Supplies    
504,286
      
486,002
  
Goods in transit    
237,539
      
274,175
  
     
2,734,137
      
2,584,372
  
Allowance for obsolescence (see Note 22 (i))    
(209,796
 )    
(216,068
 )
     
2,524,341
      
2,368,304