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Note 11 - Restricted Net Assets (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
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