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Note 14 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 14, 2024 | Jun. 08, 2023 | Aug. 11, 2022 | Mar. 07, 2022 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 28, 2021 | Jun. 04, 2021 | Jun. 17, 2020
Common Stock, Shares Authorized (in shares) |  |  |  |  |  | 200,000,000 | 200,000,000 |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |  |  |
Preferred Stock, Shares Authorized (in shares) |  |  |  |  |  | 50,000,000 | 50,000,000 |  |  |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |  |  |
Common Stock, Shares, Issued (in shares) |  |  |  |  |  | 5,972,638 | 5,517,174 |  |  |  |
Preferred Stock, Shares Issued (in shares) |  |  |  |  |  | 0 | 0 |  |  |  |
Common Stock, Shares, Outstanding (in shares) |  |  |  |  |  | 5,972,638 | 5,517,174 |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  |  | $ 3.5 |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) | [1] |  |  |  |  | 1,806,434 |  |  |  |  |
Preferred Stock, Shares Outstanding (in shares) |  |  |  |  |  | 0 | 0 |  |  |  |
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) |  |  |  |  | $ 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) |  |  |  |  | $ 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 |  |  |  |  |  |
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) |  |  |  | $ 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, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  | 1 |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 8.6 |  |  | $ 2.32 | $ 3.3 |  |  |
Warrants and Rights Outstanding, Term (Year) |  |  |  | 5 years |  |  |  |  |  |  |
August 2022 Common and Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Sale of Stock, Price Per Share (in dollars per share) |  |  |  | $ 8.58 |  |  |  |  |  |  |
Warrants and Rights Outstanding |  |  |  | $ 6.0 |  |  |  |  |  |  |
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, Number of Securities Called by Each Warrant or Right (in shares) |  |  | 1 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 0.0001 | $ 0.02 |  |  |  |  |  |  |
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) |  |  | $ 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) |  |  | $ 1.59 |  |  |  |  |  |  |  |
Common Warrants Exchanged for PreFunded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 1.5899 |  |  |  |  |  |  |  |
Securities Purchase Agreement Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding |  |  | $ 5.0 |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  | $ 0.6 |  |  |  |  |  |  |  |
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) |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding |  | $ 5.1 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Issued During Period (in shares) |  | 1,806,434 |  |  |  |  |  |  |  |  |
The 2020 Shelf [Member] |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Maximum Amount of Equity Issuable |  |  |  |  |  |  |  |  |  |  | $ 100.0
At-the-market Offering [Member] |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Maximum Amount of Equity Issuable |  |  |  |  |  |  |  |  |  | $ 30.0 |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  | 699,929 |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  |  | $ 2.9 |  |  |  |
The 2021 Shelf [Member] |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Maximum Amount of Equity Issuable |  |  |  |  |  |  | $ 82.4 |  | $ 100.0 |  |
The 2024 Shelf [Member] |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Maximum Amount of Equity Issuable |  |  |  |  |  | $ 100.0 |  |  |  |  |
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 |  |  |  |  |  |
The August 2022 Offering [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 1,075,290 |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  | $ 10.0 |  |  |  |  |  |  |
Payment of Financing and Stock Issuance Costs |  |  |  | $ 0.9 |  |  |  |  |  |  |
Sale of Stock, Price Per Share (in dollars per share) |  |  |  | $ 8.6 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Outstanding (in shares) |  |  |  |  |  | 25,360 |  |  |  |  |
[1] | The warrants issued during fiscal 2024 were a result of 1,806,434 Tranche B Warrants being exercise to 1,806,434 Tranche B Pre-Funded Warrants.

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