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Note 5 - Lease Obligations and Other Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2021
Notes Tables |
Lessee, Lease, Liability, Maturity [Table Text Block] |
Remaining Maturities of Lease Liabilities |  |  |  |
Year Ending December 31, |  | Operating Leases |
2021 |  | $ | 902 |
2022 |  |  | 805 |
2023 |  |  | 666 |
2024 |  |  | 584 |
2025 |  |  | 582 |
Thereafter |  |  | 7,327 |
Total lease payments |  |  | 10,866 |
Less imputed interest |  |  | 5,982 |
Total |  | $ | 4,884 |

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- Definition Tabular disclosure of undiscounted cash flows of both operating and finance lease liabilities. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating and finance lease liabilities recognized in statement of financial position. + References No definition available. + Details
Name: | bcrx_LesseeLeaseLiabilityMaturityTableTextBlock
Namespace Prefix: | bcrx_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration