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Note 21 - Research and Development Expenses (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Research and Development Expenses [Table Text Block]
    2019   2018   2017
Gross research and development expenses    
(4,727
 )    
(4,863
 )    
(4,539
 )
Research Tax Credit    
762
      
685
      
504
  
Grants    
236
      
90
      
154
  
Net Research and development expenses    
(3,728
 )    
(4,088
 )    
(3,881
 )