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Note 14 - Supplemental Balance Sheet Information - Other Noncurrent Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Prepayment of property and equipment	$ 1,544	$ 0
Deductible input value-added tax	1,304	1,256
Others	271	24
Total	$ 3,119	$ 1,280

X

- Definition

Amount of noncurrent assets of deductible input value added tax.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount of noncurrent assets of prepayment of property and equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	bysi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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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

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of noncurrent assets classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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