XML 39 R30.htm IDEA: XBRL DOCUMENT v3.20.1

Note 5 - Related Party Transactions (Details Textual) $ in Thousands, ¥ in Millions	1 Months Ended		3 Months Ended
	Feb. 28, 2020 USD ($)	Feb. 28, 2020 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)
Dalian Wanchun Biotechnology Co., Ltd. [Member]
Proceeds from Short-term Debt, Total	$ 14	¥ 0.1	$ 29	¥ 0.2

X

- Definition

The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=bysi_DalianWanchunBiotechnologyCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: