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Note 16 - Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 23, 2025 | Jun. 30, 2025 | Jun. 30, 2024
Proceeds from Warrant Exercises |  |  |  | $ 3,500 |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  | 367,478 |  |  |  |  |
Other Nonoperating Income (Expense) |  |  |  |  |  |  | $ (512) |  | $ 870
Class of Warrant or Right, Outstanding (in shares) | [1] | 14,130,669 |  |  |  |  | 14,130,669 |  |
June 2025 Equity Financing [Member] |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity |  | $ 16,600 |  |  |  |  |  |  |
December 2020 Warrants, January 2022 Warrants, March 2022 Warrants, and August 2022 Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1 |  |  |  |  | 1 |  |
June 2023 Tranche A Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  |  | 1 |  |  |  |
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) |  | $ 1.59 | [2] |  | $ 1.59 |  | $ 1.59 | [2] |
Class of Warrant or Right, Exercise Price of Warrants or Rights to Prefunded Warrants (in dollars per share) |  |  |  |  | $ 1.5899 |  |  |  |
Class of Warrant or Right, Expiration, Threshold Number of Trading Days (Day) |  |  |  |  | 30 days |  |  |  |
Class of Warrant or Right, Expiration, Threshold Percentage of Exercise Price |  |  |  |  | 200.00% |  |  |  |
Class of Warrant or Right, Expiration, Threshold Exercise Price (in dollars per share) |  |  |  |  | $ 3.18 |  |  |  |
Class of Warrant or Right, Expiration, Threshold Consecutive Trading Days (Day) |  |  |  |  | 40 days |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | [2] | 2,173,912 |  |  |  |  | 2,173,912 |  |
June 2023 Tranche A Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 0.0001 |  |  |  |
June 2023 Tranche B Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  |  |  | 1 |  |  |  |  | 1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 0.0001 | [3] | $ 0.0001 |  |  | $ 0.0001 | [3] | $ 0.0001
Class of Warrant or Right, Issued During Period (in shares) |  |  |  | 1,806,434 |  |  |  |  |
Warrants and Rights Outstanding |  |  |  | $ 5,100 |  |  |  |  | $ 5,100
Class of Warrant or Right, Outstanding (in shares) | [3] | 1,630,434 |  |  |  |  | 1,630,434 |  |
June 2023 Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1 |  |  |  |  | 1 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | [4] | $ 0.0001 |  |  |  |  | $ 0.0001 |  |
Class of Warrant or Right, Outstanding (in shares) | [4] | 430,217 |  |  |  |  | 430,217 |  |
June 2025 Prefunded Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) |  | 1 |  |  |  |  | 1 |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | [5] | $ 0.0001 |  |  |  |  | $ 0.0001 |  |
Warrants and Rights Outstanding |  | $ 12,300 |  |  |  |  | $ 12,300 |  |
Other Nonoperating Income (Expense) |  | $ 1,300 |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) | [1],[5] | 8,233,332 |  |  |  |  | 8,233,332 |  |
June 2025 Prefunded Warrants [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  |  |  | 935,000 |  |  |
Class of Warrant or Right, Exercised During Period (in shares) |  |  |  |  |  | 935,000 |  |  |
Liability Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 3,821,115 |  | 3,821,115 |  |  | 3,821,115 |  | 3,821,115
Equity Warrants [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding (in shares) |  | 15,571 |  | 18,114 |  |  | 15,571 |  | 18,114
[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] | In June 2023, the Company issued these tranche A warrants to purchase 2,173,912 shares of common stock (the “Tranche A Warrants”), which 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, for either shares of common stock at an exercise price of $1.59 per share or for prefunded warrants at an exercise price of $1.5899 per prefunded warrant to purchase common stock at a future exercise price of $0.0001 per share. The Tranche A Warrants will expire upon the earlier of June 2028 or 30 days following the closing price of the Company’s common stock equaling 200% of the exercise price ($3.18 per share) for at least 40 consecutive trading days.
[3] | In June 2024, certain warrants were exercised, generating proceeds of $3.5 million, into 367,478 shares of common stock and 1,806,434 prefunded warrants to purchase shares of common stock with an exercise price of $0.0001 per share (the “Tranche B Prefunded Warrants”), and may be exercised at any time subject to certain limitations as defined in the agreements between the Company and the investors on a one-for-one basis. The Tranche B Prefunded Warrants had a fair value of approximately $5.1 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.
[4] | Each of these prefunded warrants is exercisable at any time for one share of the Company’s common stock on a one-for-one basis under the terms of the agreements between the Company and the investors.
[5] | 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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