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Note 11 - Net Income (Loss) Per Ordinary Share (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three
months ended
March
3
1
,
 
   
201
9
   
201
8
 
Options to purchase ordinary shares
   
306,951
     
508,618
 
Unvested RSUs
   
62,263
     
405,527