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v3.25.1

Note 14 - Segment Reporting and Geographic Information (Details Textual) - Seed [Member] | Mar. 31, 2025 | Dec. 13, 2024
--- | --- | ---
Minimum [Member] |  |
Investment Owned, Disposal Percentage | 90.00% | 90.00%
Maximum [Member] |  |
Investment Owned, Disposal Percentage | 100.00% | 100.00%

X
- Definition Represents the percentage of investment owned to be disposed. + References No definition available. + Details
Name: | bysi_InvestmentOwnedDisposalPercentage
Namespace Prefix: | bysi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bysi_SeedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |