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Note 11 - Net Loss Per Ordinary Share (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three months ended March 31,
 
   
2020
   
2019
 
Outstanding options to purchase ordinary shares
   
135,301
     
306,951
 
Unvested RSUs
   
58,534
     
62,263