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Note 6 - Net Sales (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of the reconciliation between gross sales and net sales [text block]
    2017     2016     2015  
Gross sales
(i)
    
72,411.0
      
79,551.1
      
97,214.2
  
Excise duty    
(16,192.9
 )    
(16,345.2
 )    
(17,471.7
 )
Discounts
(i)
    
(8,318.8
 )    
(17,603.3
 )    
(33,022.3
 )
     
47,899.3
      
45,602.6
      
46,720.2