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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ in Billions	Apr. 24, 2020	Nov. 08, 2017
Maximum Aggregate Offering Price		$ 0.2
Subsequent Event [Member]
Maximum Aggregate Offering Price	$ 0.5

X

- Definition

Represents the maximum aggregate offering price of common stock, preferred stock, depository shares, stock purchase contracts, warrants and units.

+ References

No definition available.

+ Details

Name:	bcrx_MaximumAggregateOfferingPrice
Namespace Prefix:	bcrx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: