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Note 8 - Stockholders' Equity | 12 Months Ended
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Dec. 31, 2024
Notes to Financial Statements |
Equity [Text Block] |
(8) | Stockholders’ Equity
Warrants – Set forth below is a table of activity of warrants for common stock and the related weighted average exercise price per warrant.
|  | Number of |  |  | Weighted |
|  | Common Stock |  |  | Average |
|  | Equivalents |  |  | Exercise Price |
Balance as of December 31, 2022 |  |  | 161,648 |  |  | $ | 95.40 |
Warrants expired |  |  | (19,759 | ) |  |  | 101.25 |
Balance as of December 31, 2023 |  |  | 141,889 |  |  | $ | 94.50 |
Warrants for common stock sold |  |  | 2,467,104 |  |  |  | 3.10 |
Warrants expired |  |  | (141,889 | ) |  |  | 94.50 |
Balance as of December 31, 2024 |  |  | 2,467,104 |  |  | $ | 3.10 |
Reverse Stock Split - On May 30, 2024, we effected a 1-for-15 reverse stock split of our common stock, and reduced the authorized common shares from 100,000,000 to 50,000,000. The par value was not adjusted as a result of the reverse stock split. All issued and outstanding common stock, warrants, stock options, restricted stock units and per share amounts contained in the accompanying consolidated financial statements and notes have been retroactively adjusted to give effect to the reverse stock split for all periods presented. September 2024 Financing - On August 29, 2024, we entered into securities purchase agreements (the Purchase Agreements) with certain purchasers, pursuant to which we agreed to issue, and sell and the purchasers, in the aggregate to buy, in a public offering (the Registered Offering) (i) 1,377,990 shares of our common stock, $0.001 par value per share (the Common Stock), and accompanying warrants to purchase up to 1,377,990 shares of Common Stock (the Common Warrants), at an offering price of $3.00 per share of Common Stock and accompanying Common Warrant, and (ii) pre-funded warrants (the “Pre-Funded Warrants” and together with the Common Warrants the “Warrants”) to purchase up to 1,022,010 shares of Common Stock and accompanying Common Warrants to purchase up to 1,022,010 shares of Common Stock, at an offering price of $2.999 per Pre-Funded Warrant and accompanying Common Warrant. Certain of the Company’s directors and executive officers purchased an aggregate of 211,000 shares of Common Stock and accompanying Common Warrants. The Registered Offering closed on September 3, 2024, with the Company issuing 2,400,000 shares of Common Stock, including the exercise of the Pre-Funded Warrants, and Common Warrants to purchase 2,400,000 shares of Common Stock. Each Common Warrant is exercisable at a price per share of $3.00 and expires on September 3, 2029. The gross proceeds of the Registered Offering were $7.2 million, with associated issuance costs of $926,000. February 2024 Financing - On February 9, 2024, we entered into a Securities Purchase and Registration Rights Agreement relating to a private placement with certain qualified institutional buyers and institutional accredited investors, which closed on February 13, 2024. Pursuant to the agreement, we sold 134,199 shares of our common stock, and warrants to purchase 67,104 shares of our common stock at an exercise price equal to $6.60 per warrant share, subject to certain adjustments, as provided under the terms of the warrant, which are exercisable at any time before February 13, 2026. The gross proceeds of the Offering were $875,000, with associated issuance costs of $43,000. November 2023 Financing - On November 16, 2023, we sold 133,333 shares of our common stock in a registered direct offering (the Offering) at a price of $9.75 per share. The gross proceeds of the Offering were $1.3 million, with associated issuance costs of $312,000. June 2023 Financing - On June 21, 2023, we sold to certain existing investors and other institutional investors, as well as certain of our directors and officers, 75,543 shares of our common stock in a registered direct offering (the June 2023 Offering) at an offering price of $35.04 per share. Certain of our directors and executive officers purchased an aggregate of 13,556 of such shares. The gross proceeds of the June 2023 Offering were approximately $2.6 million, with associated issuance costs of approximately $194,000. At-the-Market (ATM) Offerings - On April 12, 2022, we entered into a sales agreement (Cantor Sales Agreement) with Cantor Fitzgerald & Co. (Cantor) as the sales agent, pursuant to which we may offer and sell, from time to time, through Cantor, shares of common stock having an aggregate offering price of up to $10.5 million (ATM Offering). Under the terms of the Cantor Sales Agreement, Cantor was paid a commission of 3% of the aggregate proceeds from the sale of shares and reimbursed certain legal fees. The prospectus supplement expired in conjunction with the expiration of the corresponding registration statement on October 20, 2023. On June 20, 2023, we agreed with Cantor to indefinitely suspend sales under the ATM Offering, and on November 14, 2023, we agreed to terminate the Cantor Sales Agreement. On December 6, 2023, we entered into an “At The Market” offering agreement (the Sales Agreement) with H.C. Wainwright & Co., LLC (HCW). Under the Sales Agreement, we may offer and sell our common stock, from time to time having an aggregate offering amount of up to $2.75 million during the term of the Sales Agreement through or to HCW as sales agent or principal, of which $264,000 was available as of September 30, 2024. We have filed a prospectus supplement, the ATM Prospectus Supplement, relating to the offer and sale of the shares pursuant to the Sales Agreement. The offering and sale of the shares will be made pursuant to the Company’s previously filed and effective Registration Statement on Form S-3 (File No. 333-275099), which was initially filed with the Securities and Exchange Commission (the “SEC”) on October 19, 2023 and declared effective on December 5, 2023. We have agreed to pay HCW a commission equal to 3% of the gross proceeds from the sales of shares and have agreed to provide HCW with customary indemnification and contribution rights. On December 2, 2024, we filed a prospectus supplement to the ATM Prospectus Supplement that updated the maximum aggregate offering amount to approximately $1.3 million. During the years ended December 31, 2024 and 2023, we sold an aggregate of 428,864 and 14,349 shares of common stock under the ATM Offerings at then-market prices for total gross proceeds of approximately $2.5 million and $441,000, with associated issuance costs of $94,000 and $179,000, respectively. As of December 31, 2024, approximately $1.3 million of common stock may still be sold pursuant to the Sales Agreement.

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