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Note 5 - Stockholders' Equity (Details Textual) - USD ($) $ in Millions	Mar. 03, 2015	Nov. 06, 2013
Maximum Aggregate Offering Price	$ 150	$ 125
Remaining Aggregate Offering Price		$ 10

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

- Definition

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

+ References

No definition available.

+ Details

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