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Note 11 - Supplemental Balance Sheet Information - Other Noncurrent Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Deductible input value-added tax	$ 117	$ 113
Others	98	100
Total	$ 215	$ 213

X

- Definition

Amount of noncurrent assets of deductible input value added tax.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherAssetsMiscellaneousNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of noncurrent assets classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_OtherAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant