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Note 6 - Net Sales (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of the reconciliation between gross sales and net sales [text block]
      2018       2017       2016  
Gross sales and/or services    
73,628.9
      
72,411.0
      
79,551.1
  
Excise duty    
(15,876.6
 )    
(16,192.9
 )    
(16,345.2
 )
Discounts    
(7,521.0
 )    
(8,318.8
 )    
(17,603.3
 )
     
50,231.3
      
47,899.3
      
45,602.6