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Note 10 - Additional Information on Operating Expenses by Nature (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of depreciation and amortisation expense [text block]
    Depreciation and impairment of property, plant and equipment     Amortization of intangible assets  
    2017     2016     2015     2017     2016     2015  
                                     
Cost of sales    
2,364.7
      
2,283.3
      
2,053.2
      
6.2
      
4.3
      
3.2
  
Distribution expenses    
197.6
      
200.9
      
177.9
      
-
      
-
      
-
  
Sales and marketing expenses    
532.2
      
538.0
      
431.5
      
142.3
      
222.9
      
162.5
  
Administrative expenses    
231.1
      
182.5
      
165.8
      
142.0
      
95.8
      
81.5
  
     
3,325.6
      
3,204.7
      
2,828.4
      
290.5
      
323.0
      
247.2