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Note 10 - Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three months ended March 31,  
    2019     2020  
    (Unaudited)     (Unaudited)  
Numerator:                
Net loss attributable to BeyondSpring Inc.—basic and diluted   $
(7,293
)   $
(16,084
)
Denominator:                
Weighted average number of ordinary shares outstanding—basic and diluted    
23,029,362
     
27,732,449
 
                 
Net loss per share —basic and diluted   $
(0.32
)   $
(0.58
)