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Note 1 - Organization and Basis of Presentation | 12 Months Ended
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Dec. 31, 2021
Notes to Financial Statements |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] | 1. Organization and Basis of Presentation Description of Business SIGA Technologies, Inc. (“SIGA” or the “Company”) is a commercial-stage pharmaceutical company. The Company's lead product, TPOXX® (“oral TPOXX®”) is a United States Food & Drug Administration ("FDA")-approved oral formulation antiviral drug for the treatment of human smallpox disease caused by variola virus. On July 13, 2018, the FDA approved oral TPOXX®. Oral TPOXX® is a novel, patented drug that is easy to store, transport and administer. Oral TPOXX® labeling, approved by the FDA, limits sales of oral TPOXX® in the U.S. to those for the U.S. Strategic National Stockpile ("Strategic Stockpile"). The Company has been delivering oral TPOXX® to the Strategic Stockpile since 2013. On December 1, 2021, the Company announced that Health Canada approved oral tecovirimat as an extraordinary use drug. On January 10, 2022, a Marketing Authorisation Application ("MAA") with the European Medicines Agency ("EMA") for oral tecovirimat was approved. The MAA was filed under the centralized application process, which authorized the sale of oral tecovirimat in European Union member states, as well as Norway (which granted separate follow-on approval), Iceland, and Liechtenstein. The EMA approved label indication covers the treatment of smallpox, monkeypox, cowpox, and vaccinia complications following vaccination against smallpox. With respect to the regulatory approvals by Health Canada and the EMA, oral tecovirimat represents the same formulation that was approved by the FDA in July 2018 under the brand name TPOXX®.

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