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Note 14 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Sep. 23, 2025 | Dec. 31, 2024 | Jun. 30, 2025 | Sep. 15, 2025 | Sep. 28, 2021 | Jun. 17, 2020
Preferred Stock, Shares Authorized (in shares) |  | 50,000,000 | 50,000,000 |  |  | 50,000,000 |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.0001 | $ 0.0001 |  |  | $ 0.0001 |  |  |  |
Preferred Stock, Shares Issued (in shares) |  | 0 | 0 |  |  | 0 |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  | 0 | 0 |  |  | 0 |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 200,000,000 | 200,000,000 |  |  | 200,000,000 |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.0001 | $ 0.0001 |  |  | $ 0.0001 |  |  |  |
Common Stock, Shares, Issued (in shares) |  | 8,976,913 | 5,972,638 |  |  | 8,976,913 |  |  |  |
Common Stock, Shares, Outstanding (in shares) |  | 8,976,913 | 5,972,638 |  |  | 8,976,913 |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  | 367,478 |  |  |  |  |  |  |
Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  | 8,233,332 |  |  |  | 8,233,332 | [1],[2] |  |  |
Class of Warrant or Right, Offering Price (in dollars per share) |  | $ 1.4999 |  |  |  | $ 1.4999 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 8,233,332 |  |  |  | 8,233,332 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 0.0001 |  |  |  | $ 0.0001 |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  | 176,000 | 176,000 |  |  |  |
June 2025 Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | [3] | $ 0.0001 |  |  |  | $ 0.0001 |  |  |  |
The 2020 Shelf [Member] |  |  |  |  |  |  |  |  |  |
Sale of Stock, Maximum Amount of Equity Issuable |  |  |  |  |  |  |  |  |  | $ 100.0
The 2021 Shelf [Member] |  |  |  |  |  |  |  |  |  |
Sale of Stock, Maximum Amount of Equity Issuable |  |  |  |  |  |  |  |  | $ 100.0 |
Public Offering [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  | $ 16.6 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 2,806,688 |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 1.5 |  |  |  | $ 1.5 |  |  |  |
Proceeds from Issuance or Sale of Equity, Net |  | $ 14.8 |  |  |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding (in shares) |  | 32,916 |  |  |  | 32,916 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued (in shares) |  |  |  |  |  |  |  | 9,911,913 |  |
Common Stock, Shares, Outstanding (in shares) |  |  |  |  |  |  |  | 9,911,913 |  |
Subsequent Event [Member] | June 2025 Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  | 935,000 |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  | 935,000 |  |  |  |  |  |
[1] | From July 2025 through the filing of this report, a total of 935,000 of the June 2025 Prefunded Warrants were exercised to 935,000 shares of common stock. See Note 14 - Stockholders’ Equity for further detail.
[2] | Relates to the June 2025 issuance of 8,233,332 prefunded warrants at a public offering price of $1.4999 to purchase 8,233,332 shares of the Company’s common stock at an exercise price of $0.0001 per share.
[3] | In June 2025, the Company raised gross proceeds of $16.6 million from the issuance of the June 2025 Common Stock the June 2025 Prefunded Warrants. The June 2025 Prefunded Warrants may be exercised on a one-for-one basis at any time subject to certain limitations as defined in the agreements between the Company and the investors. The June 2025 Prefunded Warrants had a fair value of approximately $12.3 million at issuance and are classified as derivative warrant liabilities, with the offset in additional paid in capital in stockholders’ equity in the Company’s consolidated financial statements. There was $1.3 million of issuance costs allocated to the June 2025 Prefunded Warrants, which were recorded in other (expense) income in the consolidated statement of operations. See Note 12 - Fair Value Measurements and Note 14 - Stockholders’ Equity for further detail.

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