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Note 4 - Trade Receivables (Details Textual) - Trade Accounts Receivable [Member] - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounts Receivable, after Allowance for Credit Loss, Total	$ 0	$ 0
ORLADEYO [Member]
Accounts Receivable, after Allowance for Credit Loss, Total	34,405	27,384
RAPIVAB [Member]
Accounts Receivable, after Allowance for Credit Loss, Total	78	49
Green Cross Corporation [Member]
Accounts Receivable, after Allowance for Credit Loss, Total	$ 701	$ 701

X

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 310
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=126942793&loc=d3e3073-115593

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

+ Details

Name:	us-gaap_AccountsReceivableNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_TradeAccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=bcrx_ORLADEYOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=bcrx_RAPIVABMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=bcrx_GreenCrossCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: