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Note 6 - Net Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
    Year Ended December 31,  
    2016     2017     2018  
Numerator:                  
Net loss attributable to BeyondSpring Inc.—basic and diluted   $
(12,010
 )   $
(91,763
 )   $
(54,
869
 )
Denominator:                        
Weighted average number of ordinary shares outstanding basic and diluted    
16,086,419
      
20,866,084
      
22,665,265
  
Net loss per share—basic and diluted   $
(0.75
 )   $
(4.40
 )   $
(2.42
 )