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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