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Note 9 - Commitments and Contingencies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Mar. 14, 2017	Feb. 02, 2015	Mar. 31, 2017	Mar. 31, 2016
Operating Leases, Rent Expense, Net			$ 43	$ 21
Research and Development Expenses Settled by Shares Issuance			$ 42,259
Shares Issued, Price Per Share	$ 20
Private Placement [Member] | Nereus Trust [Member]
Stock Issued in Lieu of Royalty Payments	2,112,963
Wanchun Biotech [Member]
Quarterly Royalty Payments Required As a Percentage of Gross Proceeds on Sale of Product			20.00%
Term of Royalty Payments			10 years
Wanchun Biotech and Fortis Advisors LLC [Member]
Period Following Royalty Termination Agreement, Requirement to Issue Shares		3 years
Percentage of Fully-diluted Equity Capitalization Required to Be Issued As Shares in Lieu of Royalty Payments		10.00%

X

- Definition

The percent of the fully-diluted equity capitalization of the Company required to be issued as shares in lieu of royalty payments.

+ References

No definition available.

+ Details

Name:	bysi_PercentageOfFullyDilutedEquityCapitalizationRequiredToBeIssuedAsSharesInLieuOfRoyaltyPayments
Namespace Prefix:	bysi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The requirement to issue shares in lieu of royalty payments if the Company offers an IPO within this time frame.

+ References

No definition available.

+ Details

Name:	bysi_PeriodFollowingRoyaltyTerminationAgreementRequirementToIssueShares
Namespace Prefix:	bysi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percent of gross proceeds from the sale of product that is required to be paid out as royalties on a quarterly basis.

+ References

No definition available.

+ Details

Name:	bysi_QuarterlyRoyaltyPaymentsRequiredAsAPercentageOfGrossProceedsOnSaleOfProduct
Namespace Prefix:	bysi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the amount of research and development expense related to patent acquired settled by shares issuance.

+ References

No definition available.

+ Details

Name:	bysi_ResearchAndDevelopmentExpensesSettledBySharesIssuance
Namespace Prefix:	bysi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of shares issued in lieu of royalty payments.

+ References

No definition available.

+ Details

Name:	bysi_StockIssuedInLieuOfRoyaltyPayments
Namespace Prefix:	bysi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The term in which royalty payments are due.

+ References

No definition available.

+ Details

Name:	bysi_TermOfRoyaltyPayments
Namespace Prefix:	bysi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

+ Details

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

X

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

Name:	us-gaap_SharesIssuedPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=bysi_NereusTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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