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Note 1 - Nature of the Business - Schedule of Subsidiaries (Details)	Dec. 31, 2021
BeyondSpring Pharmaceuticals Inc. [Member]
Equity method investment, ownership percentage	100.00%
SEED Therapeutics Inc. [Member]
Equity method investment, ownership percentage	58.97%
BeyondSpring Ltd. [Member]
Equity method investment, ownership percentage	100.00%
SEED Technology Limited [Member]
Equity method investment, ownership percentage	57.97%
BeyondSpring HK [Member]
Equity method investment, ownership percentage	100.00%
SEED Therapeutics US, Inc. [Member]
Equity method investment, ownership percentage	58.97%
Wanchun Biotechnology Limited [Member]
Equity method investment, ownership percentage	100.00%
Wanchun Biotechnology (Shenzhen) Ltd. [Member]
Equity method investment, ownership percentage	100.00%
Dalian Wanchunbulin Pharmaceuticals Ltd. (“Wanchunbulin”) [Member]
Equity method investment, ownership percentage	57.97%
BeyondSpring Pharmaceuticals Australia PTY Ltd. (“BeyondSpring Australia”) [Member]
Equity method investment, ownership percentage	100.00%
Beijing Wanchun Pharmaceutical Technology Ltd. [Member]
Equity method investment, ownership percentage	57.97%

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Represents the percentage of ownership in subsidiaries.

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Name:	srt_OwnershipAxis=bysi_BeyondspringPharmaceuticalsAustraliaPtyLtdBeyondspringAustraliaMember
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