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Note 19 - Subsequent Event (Details Textual)	Jan. 11, 2022
Subsequent Event [Member]
Reducing Workforce, Percentage of Personnel	35.00%

X

- Definition

Represents deducing workforce amount as a percentage of personnel.

+ References

No definition available.

+ Details

Name:	bysi_ReducingWorkforcePercentageOfPersonnel
Namespace Prefix:	bysi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: