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Note 1 - Nature of the Business and Basis of Preparation - Schedule of Subsidiaries (Details)	Mar. 31, 2017
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%

X

- Definition

Represents the percentage of ownership in subsidiaries.

+ References

No definition available.

+ Details

Name:	bysi_OwnershipPercentageInSubsidiaries
Namespace Prefix:	bysi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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: