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Note 3 - Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    December 31,  
    2016     2017  
             
Office equipment    
17
     
39
 
Laboratory equipment    
49
     
104
 
Furniture    
2
     
-
 
Motor vehicles    
23
     
23
 
Leasehold improvements    
13
     
13
 
                 
     
104
     
179
 
Less: accumulated depreciation    
(24
)    
(56
)
                 
Property and equipment, net    
80
     
123