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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands, ¥ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY (¥)
Government Grants, Current	$ 291	$ 288
Government Grants, Credit to Profit (Loss)	$ 0
Wanchun Pharma [Member]
Government Grants, Current			$ 323	¥ 2

X

- Definition

Represents the amount of credit to profit (loss) for government grants.

+ References

No definition available.

+ Details

Name:	bysi_GovernmentGrantsCreditToProfitLoss
Namespace Prefix:	bysi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of government grants awarded to the company that will be amortized as other income within the next twelve months.

+ References

No definition available.

+ Details

Name:	bysi_GovernmentGrantsCurrent
Namespace Prefix:	bysi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	dei_LegalEntityAxis=bysi_WanchunPharmaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: