XML 70 R43.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Note 1 - Nature of the Business - Schedule of Subsidiaries (Details) | Dec. 31, 2023
--- | ---
BeyondSpring Pharmaceuticals Inc. [Member] |
Equity method investment, ownership percentage | 100.00%
BeyondSpring Ltd. [Member] |
Equity method investment, ownership percentage | 100.00%
BeyondSpring HK [Member] |
Equity method investment, ownership percentage | 100.00%
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%
Beijing Wanchun Pharmaceutical Technology Ltd. [Member] |
Equity method investment, ownership percentage | 57.97%
SEED Therapeutics Inc. [Member] |
Equity method investment, ownership percentage | 55.05%
SEED Technology Limited [Member] |
Equity method investment, ownership percentage | 57.97%
SEED Therapeutics US, Inc. [Member] |
Equity method investment, ownership percentage | 55.05%
Wanchun Hongji (Dalian) Pharmaceuticals Ltd. [Member] |
Equity method investment, ownership percentage | 55.05%

X
- Definition Represents the percentage of ownership in subsidiaries. + References No definition available. + Details
Name: | bysi_OwnershipPercentageInSubsidiaries
Namespace Prefix: | bysi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_OwnershipAxis=bysi_BeyondSpringPharmaceuticalsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=bysi_BeyondSpringLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=bysi_BeyondSpringHKMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=bysi_WanchunBiotechnologyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=bysi_WanchunBiotechnologyShenzhenLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=bysi_DalianWanchunbulinPharmaceuticalsLtdWanchunbulinMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=bysi_BeijingWanchunPharmaceuticalTechnologyLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=bysi_SEEDTherapeuticsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=bysi_SEEDTechnologyLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=bysi_SeedTherapeuticsUSIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=bysi_WanchunHongjiDalianPharmaceuticalsLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |