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Note 11 - Stockholders' Equity and Common Stock Warrants | 12 Months Ended
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Dec. 31, 2024
Notes to Financial Statements |
Equity [Text Block] | Note 11. Stockholders' Equity and Common Stock Warrants April 2024 Private Placement On April 1, 2024, pursuant to and in accordance with the terms of a securities purchase agreement with certain purchasers named therein, the Company completed the private placement of an aggregate of 2,083,262 common shares, 2,532,285 Series A Warrants and 449,023 Pre-Funded Warrants. The aggregate upfront gross proceeds from the 2024 Private Placement were approximately $50.0 million, before deducting approximately $3.6 million of offering fees and expenses. The Pre-Funded Warrants and Series A Warrants were classified as a component of stockholders’ equity within additional paid-in capital. The Pre-Funded Warrants and Series A Warrants are equity classified because they (i) are freestanding financial instruments that are legally detachable and separately exercisable from the equity instruments, (ii) are immediately exercisable, (iii) do not embody an obligation for the Company to repurchase its shares, (iv) permit the holders to receive a fixed number of shares of common stock upon exercise, (v) are indexed to the Company’s common stock and (vi) meet the equity classification criteria. Warrants As of December 31, 2024, the Company had the following warrants outstanding to acquire shares of its common stock:
|  | Outstanding |  |  | Range of exercise price per share |  | Expiration dates
Historical Diffusion common stock warrants |  |  | 33,386 |  |  |  | $44.55 | - | $98.48 |  | May 2025 through February 2026
Historical EIP common stock warrants |  |  | 43,618 |  |  |  |  | $19.81 |  |  | April 2028
Series A common stock warrants |  |  | 2,532,285 |  |  |  |  | $39.24 |  |  | April 2027
|  |  | 2,609,289 |  |  |  |  |  |  |  |
December 2024 Pre-Funded Warrant Exercise On December 11, 2024, 449,023 Pre-Funded Warrants to purchase common stock issued in connection with the closing of the April 2024 Private Placement were exercised in full by the holder thereof pursuant to the cashless exercise provision of the Pre-Funded Warrants. Upon exercise, 45 shares were withheld in lieu of a cash payment of the exercise price and the holder was issued 448,978 shares of common stock. February 2024 Pre-Funded Warrant Exercise On February 26, 2024, following the effectiveness of an amendment eliminating certain beneficial ownership limitations set forth therein, 499,995 pre-funded warrants to purchase common stock issued in connection with the closing of the Merger were exercised in full by the holder thereof pursuant to the cashless exercise provision of the pre-funded warrants. Upon exercise, 36 shares were withheld in lieu of a cash payment of the exercise price and the holder was issued 495,959 shares of common stock. "At-The-Market" Sales Agreement The Company was previously party to the 2022 Sales Agreement with BTIG. The 2022 Sales Agreement was an "at-the-market" sales agreement pursuant to which the Company was able to, from time to time and through BTIG as the Company’s agent, sell up to an aggregate of $20.0 million in shares of common stock by any permissible method deemed an “at-the-market offering” as defined in Rule 415(a)(4) under the Securities Act. On October 1, 2024, pursuant to and in accordance with Section 12(b) thereof, we notified BTIG that we were terminating the Sales Agreement effective October 11, 2024. We were not subject to any termination penalties or other expenses related to the termination of the 2022 Sales Agreement and, prior to termination, no shares were sold pursuant to the 2022 Sales Agreement. Sale of Common stock In July 2023, EIP sold 63,422 shares of common stock at $12.78 per share (as adjusted for the Exchange Ratio) for net proceeds of approximately $0.8 million.

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