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Note 21 - Financial Income, Net (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Interest Income and Interest Expense Disclosure [Table Text Block]
    2018   2017   2016
Interest income    
19
     
18
     
21
 
Interest expense    
(111
)    
(44
)    
(57
)
Warrants exercised / forfeited    
889
     
625
     
174
 
Changes in fair value of Financial Instrument
(1)
   
     
2,044
     
3,811
 
Total    
797
     
2,643
     
3,949