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Note 5 - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
    Year Ended December 31,  
    2015     2016     2017  
                   
Cayman Islands    
489
     
894
     
2,045
 
U.S.    
5,921
     
9,840
     
80,008
 
PRC    
1,642
     
1,338
     
11,341
 
BVI    
-
     
-
     
2,498
 
Australia    
-
     
473
     
496
 
                         
Net loss before income taxes    
8,052
     
12,545
     
96,388
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
    Year Ended December 31,  
    2015     2016     2017  
                   
Net loss before income taxes    
8,052
     
12,545
     
96,388
 
                         
Expected income tax benefit    
2,818
     
4,391
     
33,736
 
Tax rate differential    
297
     
581
     
5,796
 
Non-deductible expenses    
(351
)    
(152
)    
(25,299
)
Deemed disposal gain*    
-
     
-
     
(10,506
)
Impact of U.S. statutory tax rate change    
-
     
-
     
(2,943
)
Non-taxable income    
-
     
-
     
227
 
Others    
28
     
(63
)    
74
 
Change in valuation allowance    
(2,792
)    
(4,757
)    
(1,085
)
                         
Total income tax benefit    
-
     
-
     
-
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
    December 31,  
    2016     2017  
             
Deferred tax assets:              
Net operating loss carryforward    
8,317
     
7,244
 
Intangible asset    
428
     
329
 
Deferral of tax deduction of R&D expense    
409
     
1,239
 
Share based compensation    
-
     
1,427
 
Less: valuation allowance    
(9,154
)    
(10,239
)
                 
Net deferred tax assets    
-
     
-