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Note 3 - Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Property, Plant and Equipment [Table Text Block]
     
December 31,
 
     
2015
     
2016
 
                 
Office equipment    
2
     
17
 
Laboratory equipment    
-
     
49
 
Furniture    
1
     
2
 
Motor vehicles    
24
     
23
 
Leasehold improvements    
13
     
13
 
                 
     
40
     
104
 
Less: accumulated depreciation    
(6
)    
(24
)
                 
Property and equipment, net    
34
     
80