Note 3 - Sale of Stock for Cash	9 Months Ended
Sep. 30, 2023
Notes to Financial Statements
Stock Purchase Agreement [Text Block]	Note 3. Sale of Stock for Cash *Lincoln Park Financing* On December 13, 2022, we entered into a stock purchase agreement (the “2022 LPC Purchase Agreement”) with Lincoln Park, pursuant to which Lincoln Park agreed to purchase from us at our request up to an aggregate of $10,000,000 of our common stock (subject to certain limitations) from time to time over a period of three years. The agreement allows us, at our sole discretion, to direct Lincoln Park to purchase shares of our common stock, subject to limitations in both volume and dollar amount. The purchase price of the shares that may be sold to Lincoln Park under the agreement is the lower of (i) the lowest sale price on the date of purchase, or (ii) the average of the three lowest closing prices in the prior 12 business days. There are no restrictions on future financings, rights of first refusal, participation rights, penalties, or liquidated damages other than a prohibition on entering into a “Variable Rate Transaction,” as defined in the agreement. Concurrently with the 2022 LPC Purchase Agreement, we entered into a Registration Rights Agreement, pursuant to which we filed a registration statement on Form S-1 with the SEC on December 23, 2022. This registration statement was declared effective on January 19, 2023. During the three and nine months ended September 30, 2023, we sold 1,190,223 and 2,833,846 shares of our common stock to Lincoln Park, and received $203,000 and $502,000, respectively, in gross and net proceeds. During the three and nine months ended September 30, 2022, pursuant to a prior (similar) arrangement, we sold 2,440,958 and 4,353,919 shares of our common stock to Lincoln Park, and received $485,000 and $903,000, respectively, in gross and net proceeds. *Unit Offerings* We did not sell any shares in our Unit Offerings during the three months ended September 30, 2023. During the nine months ended September 30, 2023, we sold 5,234,948 shares of our common stock and received $995,000 in gross and net proceeds from accredited investors. In addition to the shares, we issued each investor a six-month and a five-year warrant to purchase additional shares. (See Note 6, “Warrants Issued in Unit Offering”.) During the three and nine months ended September 30, 2022, pursuant to our unit offerings, we sold 3,766,126 and 13,568,524 shares of our common stock and received $632,000 and $2,364,000 in gross and net proceeds from thirty accredited investors. In addition to the shares, we issued each investor a six-month and a five-year warrant to purchase additional shares. (See Note 6, “Warrants Issued in Unit Offering”.)

Note 3 - Sale of Stock for Cash

9 Months Ended

Sep. 30, 2023

Note 3. Sale of Stock for Cash

Lincoln Park Financing

On December 13, 2022, we entered into a stock purchase agreement (the “2022 LPC Purchase Agreement”) with Lincoln Park, pursuant to which Lincoln Park agreed to purchase from us at our request up to an aggregate of $10,000,000 of our common stock (subject to certain limitations) from time to time over a period of three years. The agreement allows us, at our sole discretion, to direct Lincoln Park to purchase shares of our common stock, subject to limitations in both volume and dollar amount. The purchase price of the shares that may be sold to Lincoln Park under the agreement is the lower of (i) the lowest sale price on the date of purchase, or (ii) the average of the three lowest closing prices in the prior 12 business days. There are no restrictions on future financings, rights of first refusal, participation rights, penalties, or liquidated damages other than a prohibition on entering into a “Variable Rate Transaction,” as defined in the agreement. Concurrently with the 2022 LPC Purchase Agreement, we entered into a Registration Rights Agreement, pursuant to which we filed a registration statement on Form S-1 with the SEC on December 23, 2022. This registration statement was declared effective on January 19, 2023.

During the three and nine months ended September 30, 2023, we sold 1,190,223 and 2,833,846 shares of our common stock to Lincoln Park, and received $203,000 and $502,000, respectively, in gross and net proceeds.

During the three and nine months ended September 30, 2022, pursuant to a prior (similar) arrangement, we sold 2,440,958 and 4,353,919 shares of our common stock to Lincoln Park, and received $485,000 and $903,000, respectively, in gross and net proceeds.

Unit Offerings

We did not sell any shares in our Unit Offerings during the three months ended September 30, 2023. During the nine months ended September 30, 2023, we sold 5,234,948 shares of our common stock and received $995,000 in gross and net proceeds from accredited investors. In addition to the shares, we issued each investor a six-month and a five-year warrant to purchase additional shares. (See Note 6, “Warrants Issued in Unit Offering”.)

During the three and nine months ended September 30, 2022, pursuant to our unit offerings, we sold 3,766,126 and 13,568,524 shares of our common stock and received $632,000 and $2,364,000 in gross and net proceeds from thirty accredited investors. In addition to the shares, we issued each investor a six-month and a five-year warrant to purchase additional shares. (See Note 6, “Warrants Issued in Unit Offering”.)