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Note 5 - Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Property, Plant and Equipment [Table Text Block]
  

December 31,

 
  

2020

  

2021

 
   $   $ 
         

Office equipment

  181   350 

Laboratory equipment

  121   1,009 

Motor vehicles

  24   108 

Leasehold improvements

  116   274 
         
   442   1,741 

Less: accumulated depreciation

  (258

)

  (319

)

         

Property and equipment, net

  184   1,422