Note 1 - Nature of Operation	6 Months Ended
Sep. 30, 2023
Notes To Financial Statements [Abstract]
Nature Of Operations	1. Nature of operation Acasti Pharma Inc. (“Acasti” or the “Corporation”) is incorporated under the Business Corporations Act (Québec) (formerly Part 1A of the Companies Act (Québec)). The Corporation is domiciled in Canada and its registered office is located at 2572 boul. Daniel-Johnson, 2nd Floor Laval, Québec, Canada H7T 2R3. The Corporation’s shares are listed on the Nasdaq Capital Market (the "Nasdaq"), and through March 27, 2023 the Corporation's shares were also listed on the TSX Venture Exchange ("TSXV"), in each case, under the symbol "ACST". On March 13, 2023 the Corporation received approval to voluntarily delist from the TSXV. Effective as at the close of trading on March 27, 2023, the Corporation's common shares are no longer listed and posted for trading on the TSXV. In August 2021, the Corporation completed the acquisition via a share-for-share merger of Grace Therapeutics, Inc. (“Grace”), a privately held emerging biopharmaceutical company focused on developing innovative drug delivery technologies for the treatment of rare and orphan diseases. The post-merger Corporation is focused on building a late-stage specialty pharmaceutical company specializing in rare and orphan diseases and developing and commercializing products that improve clinical outcomes using its novel drug delivery technologies. The Corporation seeks to apply new proprietary formulations to existing pharmaceutical compounds to achieve enhanced efficacy, faster onset of action, reduced side effects, more convenient delivery and increased patient compliance; all of which could result in improved patient outcomes. The active pharmaceutical ingredients chosen by the Corporation for further development may be already approved in the target indication or could be repurposed for use in new indications. The Corporation has incurred operating losses and negative cash flows from operations in each year since its inception. The Corporation expects to incur significant expenses and continued operating losses for the foreseeable future. In May 2023, the Corporation implemented a strategic realignment plan to enhance shareholder value that resulted in the Corporation engaging a new management team, streamlining its research and development activities to concentrate on its lead product, GTX-104, and greatly reducing its workforce. Moving forward, the Corporation plans to build a smaller, more focused organization in the United States. Further development of GTX-102 and GTX-101 will occur at such time as additional funding is obtained or strategic partnerships are entered into. On September 24, 2023, the Corporation entered into a securities purchase agreement with certain institutional and accredited investors. Gross proceeds to the Corporation from this private placement were approximately $7,500, before deducting fees and expenses. The Corporation issued and sold an aggregate of 1,951,371 common shares, no par value per share, pre-funded warrants to purchase up to an aggregate of 2,106,853 common shares, each at a purchase price of $1.8481 per common share and accompanying common warrants to purchase up to an aggregate of 2,536,391 common shares. The Corporation currently intends to use the net proceeds from the private placement for clinical trial expenses to further the Phase 3 clinical trial for GTX-104, pre-commercial planning, working capital and other general corporate purposes. The Corporation believes its cash runway, including net proceeds from this financing, will be sufficient to fund the Corporation’s operations into the second calendar quarter of 2026. The Corporation will require additional capital to fund its daily operating needs beyond that time. The Corporation does not expect to generate revenue from product sales unless and until it successfully completes drug development and obtains regulatory approval, which the Corporation expects will take several years and is subject to significant uncertainty. To date, the Corporation has financed its operations primarily through public offerings and private placements of its common shares, warrants and convertible debt and the proceeds from research tax credits. Until such time that the Corporation can generate significant revenue from drug product sales, if ever, it will require additional financing, which is expected to be sourced from a combination of public or private equity or debt financing or other non-dilutive sources, which may include fees, milestone payments and royalties from collaborations with third parties. Arrangements with collaborators or others may require the Corporation to relinquish certain rights related to its technologies or drug product candidates. Adequate additional financing may not be available to the Corporation on acceptable terms, or at all. The Corporation’s inability to raise capital as and when needed could have a negative impact on its financial condition and its ability to pursue its business strategy. The Corporation plans to raise additional capital in order to maintain adequate liquidity. Negative results from studies or trials, if any, and depressed prices of the Corporation’s stock could impact the Corporation’s ability to raise additional financing. Raising additional equity capital is subject to market conditions not within the Corporation’s control. If the Corporation is unable to raise additional funds, the Corporation may not be able to realize its assets and discharge its liabilities in the normal course of business. The Corporation remains subject to risks similar to other development stage companies in the biopharmaceutical industry, including compliance with government regulations, protection of proprietary technology, dependence on third-party contractors and consultants and potential product liability, among others. Please refer to the risk factors included in Part 1, Item 1A of the Corporation’s Annual Report on Form 10-K for the year ended March 31, 2023, filed with the SEC on June 23, 2023 (the “Annual Report”). Reverse stock split On June 29, 2023, the Board of Directors of the Corporation approved an amendment to the Corporation's Articles of Incorporation to implement a reverse stock split of the Corporation's Class A common shares, no par value per share, at a ratio of 1-for-6 (the “Reverse Stock Split”). On July 4, 2023, the Corporation filed Articles of Amendment to its Articles of Incorporation with the Registraire des entreprises du Québec, to implement the Reverse Stock Split. All references in these financial statements to number of common shares, warrants and options, price per share and weighted average number of shares outstanding have been adjusted to reflect the Reverse Stock Split, which became effective on July 10, 2023.

Note 1 - Nature of Operation

6 Months Ended

Sep. 30, 2023

Notes To Financial Statements [Abstract]

1. Nature of operation

Acasti Pharma Inc. (“Acasti” or the “Corporation”) is incorporated under the Business Corporations Act (Québec) (formerly Part 1A of the Companies Act (Québec)). The Corporation is domiciled in Canada and its registered office is located at 2572 boul. Daniel-Johnson, 2nd Floor Laval, Québec, Canada H7T 2R3.

The Corporation’s shares are listed on the Nasdaq Capital Market (the "Nasdaq"), and through March 27, 2023 the Corporation's shares were also listed on the TSX Venture Exchange ("TSXV"), in each case, under the symbol "ACST". On March 13, 2023 the Corporation received approval to voluntarily delist from the TSXV. Effective as at the close of trading on March 27, 2023, the Corporation's common shares are no longer listed and posted for trading on the TSXV.

In August 2021, the Corporation completed the acquisition via a share-for-share merger of Grace Therapeutics, Inc. (“Grace”), a privately held emerging biopharmaceutical company focused on developing innovative drug delivery technologies for the treatment of rare and orphan diseases. The post-merger Corporation is focused on building a late-stage specialty pharmaceutical company specializing in rare and orphan diseases and developing and commercializing products that improve clinical outcomes using its novel drug delivery technologies. The Corporation seeks to apply new proprietary formulations to existing pharmaceutical compounds to achieve enhanced efficacy, faster onset of action, reduced side effects, more convenient delivery and increased patient compliance; all of which could result in improved patient outcomes. The active pharmaceutical ingredients chosen by the Corporation for further development may be already approved in the target indication or could be repurposed for use in new indications.

The Corporation has incurred operating losses and negative cash flows from operations in each year since its inception. The Corporation expects to incur significant expenses and continued operating losses for the foreseeable future.

In May 2023, the Corporation implemented a strategic realignment plan to enhance shareholder value that resulted in the Corporation engaging a new management team, streamlining its research and development activities to concentrate on its lead product, GTX-104, and greatly reducing its workforce. Moving forward, the Corporation plans to build a smaller, more focused organization in the United States. Further development of GTX-102 and GTX-101 will occur at such time as additional funding is obtained or strategic partnerships are entered into.

On September 24, 2023, the Corporation entered into a securities purchase agreement with certain institutional and accredited investors. Gross proceeds to the Corporation from this private placement were approximately $7,500, before deducting fees and expenses. The Corporation issued and sold an aggregate of 1,951,371 common shares, no par value per share, pre-funded warrants to purchase up to an aggregate of 2,106,853 common shares, each at a purchase price of $1.8481 per common share and accompanying common warrants to purchase up to an aggregate of 2,536,391 common shares. The Corporation currently intends to use the net proceeds from the private placement for clinical trial expenses to further the Phase 3 clinical trial for GTX-104, pre-commercial planning, working capital and other general corporate purposes. The Corporation believes its cash runway, including net proceeds from this financing, will be sufficient to fund the Corporation’s operations into the second calendar quarter of 2026.

The Corporation will require additional capital to fund its daily operating needs beyond that time. The Corporation does not expect to generate revenue from product sales unless and until it successfully completes drug development and obtains regulatory approval, which the Corporation expects will take several years and is subject to significant uncertainty. To date, the Corporation has financed its operations primarily through public offerings and private placements of its common shares, warrants and convertible debt and the proceeds from research tax credits. Until such time that the Corporation can generate significant revenue from drug product sales, if ever, it will require additional financing, which is expected to be sourced from a combination of public or private equity or debt financing or other non-dilutive sources, which may include fees, milestone payments and royalties from collaborations with third parties. Arrangements with collaborators or others may require the Corporation to relinquish certain rights related to its technologies or drug product candidates. Adequate additional financing may not be available to the Corporation on acceptable terms, or at all. The Corporation’s inability to raise capital as and when needed could have a negative impact on its financial condition and its ability to pursue its business strategy. The Corporation plans to raise additional capital in order to maintain adequate liquidity. Negative results from studies or trials, if any, and depressed prices of the Corporation’s stock could impact the Corporation’s ability to raise additional financing. Raising additional equity capital is subject to market conditions not within the Corporation’s control. If the Corporation is unable to raise additional funds, the Corporation may not be able to realize its assets and discharge its liabilities in the normal course of business.

The Corporation remains subject to risks similar to other development stage companies in the biopharmaceutical industry, including compliance with government regulations, protection of proprietary technology, dependence on third-party contractors and consultants and potential product liability, among others. Please refer to the risk factors included in Part 1, Item 1A of the Corporation’s Annual Report on Form 10-K for the year ended March 31, 2023, filed with the SEC on June 23, 2023 (the “Annual Report”).

Reverse stock split

On June 29, 2023, the Board of Directors of the Corporation approved an amendment to the Corporation's Articles of Incorporation to implement a reverse stock split of the Corporation's Class A common shares, no par value per share, at a ratio of 1-for-6 (the “Reverse Stock Split”). On July 4, 2023, the Corporation filed Articles of Amendment to its Articles of Incorporation with the Registraire des entreprises du Québec, to implement the Reverse Stock Split. All references in these financial statements to number of common shares, warrants and options, price per share and weighted average number of shares outstanding have been adjusted to reflect the Reverse Stock Split, which became effective on July 10, 2023.