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Note 3 - Property and Equipment, Net (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    December 31,     March 31,  
    2019     2020  
    $     $  
          (Unaudited)  
             
Office equipment    
150
     
161
 
Laboratory equipment    
114
     
113
 
Motor vehicles    
23
     
22
 
Leasehold improvements    
103
     
103
 
                 
     
390
     
399
 
Less: accumulated depreciation    
(181
)    
(196
)
                 
Property and equipment, net    
209
     
203