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Note 4 - Trade Receivables (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Receivables from Collaborations [Table Text Block] |
|  | December 31, 2021 |
|  | Billed |  |  | Unbilled |  |  | Total |
U.S. Department of Health and Human Services, net |  | $ | 5 |  |  | $ | 1,670 |  |  | $ | 1,675 |
Royalty receivables from partners |  |  | 305 |  |  |  | − |  |  |  | 305 |
Total receivables from collaborators |  | $ | 310 |  |  | $ | 1,670 |  |  | $ | 1,980 |
|  | December 31, 2020
|  | Billed |  |  | Unbilled |  |  | Total |
U.S. Department of Health and Human Services, net |  | $ | − |  |  | $ | 5,402 |  |  | $ | 5,402 |
Royalty receivables from partners |  |  | 2,816 |  |  |  | 25 |  |  |  | 2,841 |
Total receivables from collaborators |  | $ | 2,816 |  |  | $ | 5,427 |  |  | $ | 8,243 |

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- Definition Tabular disclosure representing receivables from collaborations. + References No definition available. + Details
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Namespace Prefix: | bcrx_
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Balance Type: | na
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration