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Note 3 - Property and Equipment, Net (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    December 31,     June 30,  
    2018     2019  
    $     $  
          (Unaudited)  
             
Office equipment    
143
     
141
 
Laboratory equipment    
111
     
115
 
Motor vehicles    
23
     
23
 
Leasehold improvements    
109
     
103
 
                 
     
386
     
382
 
Less: accumulated depreciation    
(104
)    
(145
)
                 
Property and equipment, net    
282
     
237