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Note 8 - Net Loss Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Three months ended March 31,
    2016   2017
    (Unaudited)   (Unaudited)
         
Numerator:   $
(1,844
 )   $
(47,396
 )
Net loss attributable to BeyondSpring Inc.
—basic and diluted
                
Denominator:                
Weighted average number of ordinary shares outstanding —basic and diluted    
15,750,000
      
17,834,676
  
                 
Net loss per share —basic and diluted   $
(0.12
 )   $
(2.66
 )