XML 48 R41.htm IDEA: XBRL DOCUMENT v3.21.4

Note 6 - Related Party Transactions (Details Textual) - 9 months ended Sep. 30, 2020 ¥ in Thousands, $ in Thousands	USD ($)	CNY (¥)
Dalian Wanchun Biotechnology Co., Ltd. [Member]
Proceeds from Short-term Debt, Total	$ 32	¥ 230

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=123570139&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromShortTermDebt
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: