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Note 20 - Research and Development Expenses (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Research and Development Expenses [Table Text Block]
    2018   2017   2016
Gross research and development expenses    
(4,863
 )    
(4,539
 )    
(4,577
 )
Research Tax Credit    
685
      
504
      
511
  
Grants    
90
      
154
      
198
  
Net Research and development expenses    
(4,088
 )    
(3,881
 )    
(3,868
 )