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Note 2 - Summary of Significant Accounting Policies (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_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=bysi_SeedMember
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: