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Note 1 - Nature of the Business and Group Internal Restructuring - Schedule of Subsidiaries (Details) | Dec. 31, 2017
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BeyondSpring U.S. [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%
BVI Biotech [Member] |
Equity method investment, ownership percentage | 100.00%
Wanchun Shenzhen [Member] |
Equity method investment, ownership percentage | 100.00%
Wanchunbulin [Member] |
Equity method investment, ownership percentage | 60.00%
BeyondSpring Australia [Member] |
Equity method investment, ownership percentage | 100.00%

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

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- Details
Name: | us-gaap_OwnershipAxis=bysi_BeyondSpringUSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_OwnershipAxis=bysi_BVIBiotechMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OwnershipAxis=bysi_WanchunShenzhenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OwnershipAxis=bysi_WanchunbulinMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OwnershipAxis=bysi_BeyondSpringAustraliaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |