Note 1 - Organization and Nature of Business	3 Months Ended
Mar. 31, 2026
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	NOTE 1. Organization and Nature of Business General Vaxart Biosciences, Inc. was originally incorporated in California in March 2004, under the name West Coast Biologicals, Inc. The Company changed its name to Vaxart, Inc. (“Private Vaxart”) in July 2007, and reincorporated in the state of Delaware. In February 2018, Private Vaxart completed a business combination with Aviragen Therapeutics, Inc. (“Aviragen”), pursuant to which Aviragen merged with Private Vaxart, with Private Vaxart surviving as a wholly-owned subsidiary of Aviragen (the “Merger”). Pursuant to the terms of the Merger, Aviragen changed its name to Vaxart, Inc. (together with its subsidiaries, the “Company” or “Vaxart”) and Private Vaxart changed its name to Vaxart Biosciences, Inc. In March 2025, the Company entered into an At the Market Offering Agreement (the “March 2025 ATM”) with Citizens JMP Securities, LLC (“Citizens”) and B. Riley Securities, Inc. (“B. Riley” and, together with Citizens, the “Managers”), pursuant to which the Company may offer and sell, from time to time through the Managers, shares of its common stock having an aggregate offering price of up to $50.0 million. The shares were sold pursuant to an effective registration statement on Form S-3 (Registration Statement No. 333-270671) (the “2023 Shelf Registration Statement”), as previously filed with the U.S. Securities and Exchange Commission (the “SEC”), and a prospectus supplement, dated March 21, 2025, with the SEC in connection with the offer and sale of the shares under the March 2025 ATM. The 2023 Shelf Registration Statement has since expired and on April 30, 2026, the Company’s registration statement on Form S-3 (Registration Statement No. 333-295086) (the “2026 Shelf Registration Statement”) was declared effective. Pursuant to the 2026 Shelf Registration Statement and prospectus supplement dated May 4, 2026, the Company may continue to make sales under the March 2025 ATM. The Company will pay the Managers a placement fee of up to 3% of the gross sale price from each sale of shares under the March 2025 ATM. Effective July 8, 2025, Nasdaq suspended trading in our common stock and the Company was formally delisted from Nasdaq. Our common stock has been quoted on the OTCQX under the ticker symbol “VXRT” since the stock was suspended from trading on Nasdaq on July 8, 2025. The National Securities Markets Improvement Act of 1996 prevents or preempts the states from regulating the sale of certain securities, which are referred to as “covered securities.” As Nasdaq has officially delisted our securities, our securities are not covered securities since OTCQX-traded securities are not considered covered securities, and we will need to follow each state’s blue sky laws for offers and sales of our securities made to residents of that state. This state-level regulation introduces additional compliance requirements for brokers to consider when trading in our securities and complicates the use of our ATM facility. In April 2026, the Company entered into a purchase agreement (the “April 2026 ELOC”) and a registration rights agreement with Lincoln Park Capital Fund, LLC (“LPC”), pursuant to which LPC committed to purchase up to $25.0 million (the “Commitment Amount”) of the Company’s common stock, subject to certain limitations and conditions. The Company has the right, but not the obligation, to sell shares to LPC, and LPC is obligated to make purchases as directed by the Company, subject to the conditions set forth in the agreement. See Note 13 for further details. The Company’s principal operations are based in South San Francisco, California, and it operates in one reportable segment, which is the discovery and development of oral recombinant protein vaccines, based on its proprietary oral vaccine platform.

Note 1 - Organization and Nature of Business

3 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

NOTE 1. Organization and Nature of Business

General

Vaxart Biosciences, Inc. was originally incorporated in California in March 2004, under the name West Coast Biologicals, Inc. The Company changed its name to Vaxart, Inc. (“Private Vaxart”) in July 2007, and reincorporated in the state of Delaware. In February 2018, Private Vaxart completed a business combination with Aviragen Therapeutics, Inc. (“Aviragen”), pursuant to which Aviragen merged with Private Vaxart, with Private Vaxart surviving as a wholly-owned subsidiary of Aviragen (the “Merger”). Pursuant to the terms of the Merger, Aviragen changed its name to Vaxart, Inc. (together with its subsidiaries, the “Company” or “Vaxart”) and Private Vaxart changed its name to Vaxart Biosciences, Inc.

In March 2025, the Company entered into an At the Market Offering Agreement (the “March 2025 ATM”) with Citizens JMP Securities, LLC (“Citizens”) and B. Riley Securities, Inc. (“B. Riley” and, together with Citizens, the “Managers”), pursuant to which the Company may offer and sell, from time to time through the Managers, shares of its common stock having an aggregate offering price of up to $50.0 million. The shares were sold pursuant to an effective registration statement on Form S-3 (Registration Statement No. 333-270671) (the “2023 Shelf Registration Statement”), as previously filed with the U.S. Securities and Exchange Commission (the “SEC”), and a prospectus supplement, dated March 21, 2025, with the SEC in connection with the offer and sale of the shares under the March 2025 ATM. The 2023 Shelf Registration Statement has since expired and on April 30, 2026, the Company’s registration statement on Form S-3 (Registration Statement No. 333-295086) (the “2026 Shelf Registration Statement”) was declared effective. Pursuant to the 2026 Shelf Registration Statement and prospectus supplement dated May 4, 2026, the Company may continue to make sales under the March 2025 ATM. The Company will pay the Managers a placement fee of up to 3% of the gross sale price from each sale of shares under the March 2025 ATM.

Effective July 8, 2025, Nasdaq suspended trading in our common stock and the Company was formally delisted from Nasdaq. Our common stock has been quoted on the OTCQX under the ticker symbol “VXRT” since the stock was suspended from trading on Nasdaq on July 8, 2025. The National Securities Markets Improvement Act of 1996 prevents or preempts the states from regulating the sale of certain securities, which are referred to as “covered securities.” As Nasdaq has officially delisted our securities, our securities are not covered securities since OTCQX-traded securities are not considered covered securities, and we will need to follow each state’s blue sky laws for offers and sales of our securities made to residents of that state. This state-level regulation introduces additional compliance requirements for brokers to consider when trading in our securities and complicates the use of our ATM facility.

In April 2026, the Company entered into a purchase agreement (the “April 2026 ELOC”) and a registration rights agreement with Lincoln Park Capital Fund, LLC (“LPC”), pursuant to which LPC committed to purchase up to $25.0 million (the “Commitment Amount”) of the Company’s common stock, subject to certain limitations and conditions. The Company has the right, but not the obligation, to sell shares to LPC, and LPC is obligated to make purchases as directed by the Company, subject to the conditions set forth in the agreement. See Note 13 for further details.

The Company’s principal operations are based in South San Francisco, California, and it operates in one reportable segment, which is the discovery and development of oral recombinant protein vaccines, based on its proprietary oral vaccine platform.