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Note 1 - Nature of the Business - Schedule of Subsidiaries (Details)	Mar. 31, 2025	Jan. 31, 2025
BeyondSpring Pharmaceuticals Inc. [Member]
Ownership Percentage in Subsidiaries	100.00%
BeyondSpring Ltd. [Member]
Ownership Percentage in Subsidiaries	100.00%
BeyondSpring HK [Member]
Ownership Percentage in Subsidiaries	100.00%
Wanchun Biotechnology Limited [Member]
Ownership Percentage in Subsidiaries	100.00%
Wanchun Biotechnology (Dalian) Ltd. [Member]
Ownership Percentage in Subsidiaries	100.00%
Dalian Wanchunbulin Pharmaceuticals Ltd. (“Wanchunbulin”) [Member]
Ownership Percentage in Subsidiaries	57.97%
Beijing Wanchun Pharmaceutical Technology Ltd. [Member]
Ownership Percentage in Subsidiaries	57.97%
SEED Therapeutics Inc. [Member]
Ownership Percentage in Subsidiaries	37.56%	14.37%
SEED Technology Limited [Member]
Ownership Percentage in Subsidiaries	57.97%
SEED Therapeutics US, Inc. [Member]
Ownership Percentage in Subsidiaries	37.56%
Wanchun Hongji (Dalian) Pharmaceuticals Ltd. [Member]
Ownership Percentage in Subsidiaries	37.56%

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