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Note 3 - Property and Equipment, Net
 3 Months Ended
Mar. 31, 2020
Notes to Financial Statements  
Property, Plant and Equipment Disclosure [Text Block]
3.
Property and equipment, net
 
Property and equipment consist of the following:
 
    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
  
 
Depreciation expenses for the
three
months ended
March 31, 2019
and
2020
were
$23
and
$15,
respectively.