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Note 16 - Warrants (Details Textual) $ / shares in Units, $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2024 USD ($) $ / shares shares | Jun. 08, 2023 USD ($) $ / shares shares | Jan. 06, 2023 | Sep. 30, 2024 $ / shares shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) | Jun. 30, 2024 shares | Jun. 30, 2023 $ / shares | Dec. 31, 2022 $ / shares | Aug. 11, 2022 $ / shares shares
Payments of Stock Issuance Costs | $ |  |  |  |  |  |  | $ (0) |  | $ 160 |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 5,899,880 | [1] | 5,899,880 | [1] |  | 6,075,880 | [2] |  |  |
Class of Warrant or Right, Exercised During Period (in shares) | [3] |  |  |  | 176,000 |  |  |  |  |  |  |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  | 20 |  |  |  |  |  |  |  |  |  |
Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 430,217 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  | $ 0.02
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Tranche A Common Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 2,173,912 |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 3.18 |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Tranche B Common Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 2,173,912 |  | 1,630,424 |  | 1,630,424 |  |  | 1,806,434 |  |  |  |
Proceeds from Warrant Exercises | $ |  | $ 3,500 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  | 367,478 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  | 176,000 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price, Exercised During Period (in dollars per share) | $ / shares |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Common Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 1.59 |  |  |  |  |  |  |  |  |  |  |
Common Warrants Exchanged for PreFunded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  | $ 1.5899 |  |  |  |  |  |  |  |  |  |  |
Tranche B Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 1,806,434 |  |  | 176,000 |  | 176,000 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  | $ 0.0001 |  |  | $ 0.0001 |  | $ 0.0001 |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ |  | $ 5,100 |  |  |  |  |  |  |  |  |  |  |  |
August 2022 Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.02
August 2022 Common Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,265,547
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 2.32 | $ 3.3 | $ 8.6
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Warrants and Rights Outstanding, Term (Year) |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years
August 2022 Common Warrants [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.32
August 2022 Common Warrants [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,325,581
Liability Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 3,821,115 |  | 3,821,115 |  |  | 3,821,115 |  |  |  |
Liability Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 430,217 |  | 430,217 |  |  | 430,217 |  |  |  |
Equity Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  |  |  | 18,114 |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 18,114 |  | 18,114 |  |  |  |  |  |  |
Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 1,743,695 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ |  |  | $ 4,000 |  |  |  |  |  |  |  |  |  |  |
Payment of Financing and Stock Issuance Costs | $ |  |  | 3,400 |  |  |  |  |  |  |  |  |  |  |
Securities Purchase Agreement Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ |  |  | 5,000 |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  |  | $ 600 |  |  |  |  |  |  |  |  |  |  |
[1] | The number of warrants outstanding as of September 30, 2024, is comprised of 3,821,115 liability classified warrants, 430,217 liability classified June 2023 Pre-Funded Warrants, 1,630,424 liability classified Tranche B Pre-Funded Warrants and 18,114 equity classified warrants.
[2] | The number of warrants outstanding as of June 30, 2024, is comprised of 3,821,115 liability classified warrants, 430,217 liability classified June 2023 Pre-Funded Warrants, 1,806,434 liability classified Tranche B Pre-Funded Warrants and 18,114 equity classified warrants.
[3] | The warrants exercised during the three months ended September 30, 2024, were 176,000 of the Tranche B Warrants, which were exercised at a price of $0.0001 per share.

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