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Note 9 - Restricted Net Assets (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Restricted Net Assets	$ 0	$ 0

X

- Definition

Total net assets that cannot be used for operating purposes because of contract or regulatory requirements that are in effect for a period that extends beyond one year.

+ References

No definition available.

+ Details

Name:	bysi_RestrictedNetAssets
Namespace Prefix:	bysi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant