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Note 6 - Stockholders' Equity (Details Textual) $ in Millions | Mar. 03, 2015 USD ($)
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Maximum Aggregate Offering Price | $ 150

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