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Note 14 - Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of detailed information about inventories [text block]
    Year ended December 31,  
    2017     2016  
Finished goods    
923,316
      
653,482
  
Goods in process    
619,796
      
375,822
  
Raw materials    
281,083
      
160,284
  
Supplies    
486,002
      
451,777
  
Goods in transit    
274,175
      
162,766
  
     
2,584,372
      
1,804,131
  
Allowance for obsolescence (see Note 23 (i))    
(216,068
 )    
(240,242
 )
     
2,368,304
      
1,563,889