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Note 16 - Warrants (Details Textual) $ / shares in Units, $ in Millions |  |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2024 USD ($) $ / shares shares | Jun. 08, 2023 USD ($) $ / shares shares | Jan. 06, 2023 | Mar. 07, 2022 USD ($) $ / shares shares | Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 $ / shares shares | Dec. 31, 2022 $ / shares | Oct. 25, 2022 $ / shares | Aug. 11, 2022 $ / shares shares | Jan. 26, 2022 USD ($) $ / shares
Proceeds from Warrant Exercises | $ |  |  |  |  | $ 3.5 |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 6,075,880 | [1] | 6,538,052 | [2] |  |  |  |
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 |  |  | 1,806,434 |  |  |  |  |  |  |
Proceeds from Warrant Exercises | $ | $ 3.5 |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) | 367,478 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  | 1,806,434 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ | $ 5.1 |  |  |  |  |  |  |  |  |  |  |
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 |
March 2022 Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 151,500 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  | $ 0.002 |  |  |  |  |  |  |  |
March 2022 Common Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 333,300 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  | $ 26 |  |  |  |  |  |  |  |
March 2022 Common and Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  | 1.1 |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  | 5 years |  |  |  |  |  |  |  |
Payment of Financing and Stock Issuance Costs | $ |  |  |  | $ 2.8 |  |  |  |  |  |  |  |
Avenue Capital Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  | $ 24.2 |  |  |  |  |  | $ 8.6 |  | $ 24.2
Warrants and Rights Outstanding | $ |  |  |  |  |  |  |  |  |  |  |  | $ 0.6
Liability Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 3,821,115 |  | 6,068,763 |  |  |  |  |
Liability Pre-Funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 430,217 |  | 430,217 |  |  |  |  |
Equity Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 18,114 |  | 39,072 |  |  |  |  |
Liability Tranche B Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  |  |  |  | 1,806,434 |  |  |  |  |  |  |
Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 1,743,695 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ |  | $ 4.0 |  |  |  |  |  |  |  |  |  |
Payment of Financing and Stock Issuance Costs | $ |  | 3.4 |  |  |  |  |  |  |  |  |  |
Securities Purchase Agreement Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding | $ |  | 5.0 |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  | $ 0.6 |  |  |  |  |  |  |  |  |  |
The March 2022 Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 151,500 |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ |  |  |  | $ 7.6 |  |  |  |  |  |  |  |
Payment of Financing and Stock Issuance Costs | $ |  |  |  | $ 0.8 |  |  |  |  |  |  |  |
[1] | 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.
[2] | The number of warrants outstanding as of June 30, 2023, is comprised of 6,068,763 liability classified warrants, 430,217 liability classified June 2023 Pre-Funded Warrants and 39,072 equity classified warrants.

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