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Note 6 - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
     
Year Ended December 31,
     
2014
     
2015
     
2016
 
                         
Cayman Islands    
58
     
489
     
894
 
U.S.    
1,983
     
5,921
     
9,840
 
PRC    
972
     
1,642
     
1,338
 
Australia    
-
     
-
     
473
 
                         
Net loss before income taxes    
3,013
     
8,052
     
12,545
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
     
Year Ended December 31,
 
     
2014
     
2015
     
2016
 
                         
Net loss before income taxes    
3,013
     
8,052
     
12,545
 
                         
Expected income tax benefit    
1,055
     
2,818
     
4,391
 
Tax rate differential    
95
     
297
     
581
 
Non-deductible expenses    
(240
)    
(351
)    
(152
)
Others    
(5
)    
28
     
(63
)
Change in valuation allowance    
(905
)    
(2,792
)    
(4,757
)
                         
Total income tax benefit    
-
     
-
     
-
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
     
December 31,
 
     
2015
     
2016
 
Deferred tax assets, non-current portion:                
Net operating loss carryforward    
3,811
     
8,317
 
Intangible asset    
586
     
428
 
Deferral of tax deduction of R&D expense    
-
     
409
 
Less: valuation allowance    
(4,397
)    
(9,154
)
                 
Net deferred tax assets    
-
     
-