v3.26.1
Note 1 - Nature of the Business and the Basis of Preparation - Schedule of Subsidiaries (Details)
Jun. 30, 2026
Jan. 31, 2025
BeyondSpring Pharmaceuticals Inc. [Member]    
Percentage of ownership by the Group 100.00%  
BeyondSpring Pharmaceuticals Australia PTY Ltd. (“BeyondSpring Australia”) [Member]    
Percentage of ownership by the Group 100.00%  
BeyondSpring Ltd. [Member]    
Percentage of ownership by the Group 100.00%  
BeyondSpring HK [Member]    
Percentage of ownership by the Group 100.00%  
Wanchun Biotechnology Limited [Member]    
Percentage of ownership by the Group 100.00%  
Wanchun Biotechnology (Dalian) Ltd. [Member]    
Percentage of ownership by the Group 100.00%  
Dalian Wanchunbulin Pharmaceuticals Ltd. (“Wanchunbulin”) [Member]    
Percentage of ownership by the Group 57.97%  
SEED Therapeutics Inc. [Member]    
Percentage of ownership by the Group 36.51% 13.62%
SEED Technology Limited [Member]    
Percentage of ownership by the Group 57.97%  
SEED Therapeutics US, Inc. [Member]    
Percentage of ownership by the Group 36.51%  
Wanchun Hongji (Dalian) Pharmaceuticals Ltd. [Member]    
Percentage of ownership by the Group 36.51%  
SEED LH Inc. [Member]    
Percentage of ownership by the Group 36.51%  
SEED LH MG Inc. [Member]    
Percentage of ownership by the Group 36.51%