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Note 18 - Commitments and Contingencies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Capital Commitment, Amount	$ 762

X

- Definition

The amount of commitment.

+ References

No definition available.

+ Details

Name:	bysi_CapitalCommitmentAmount
Namespace Prefix:	bysi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration