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Note 7 - Stockholders' Equity - Schedule of Warrant Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023 | Jul. 01, 2023
Outstanding (in shares) | 80 | 80 |  |
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 72.1 | $ 72.1 |  |
Outstanding, Aggregate Fair Market Value | $ 3,553 | $ 3,747 |  | $ 3,747
Outstanding, Weighted Average Remaining Contractual Term (Year) | 7 months 17 days | 1 year 7 months 6 days | 2 years 7 months 6 days |
Issued (in shares) | 0 | 0 |  |
Issued, Weighted Average Exercise Price (in dollars per share) | $ 0 | $ 0 |  |
Issued, Aggregate Fair Market Value | $ 0 | $ 0 |  |
Exercised (in shares) | 0 | 0 |  |
Exercised, Weighted Average Exercise Price (in dollars per share) | $ 0 | $ 0 |  |
Exercised, Aggregate Fair Market Value | $ 0 | $ 0 |  |
Canceled or expired (in shares) | (3) | 0 |  |
Canceled or expired, Weighted Average Exercise Price (in dollars per share) | $ 154 | $ 0 |  |
Canceled or expired, Aggregate Fair Market Value | $ (194) | $ 0 |  |
Outstanding (in shares) | 77 | 80 | 80 |
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 69.04 | $ 72.1 | $ 72.1 |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 69.04 | $ 72.1 | $ 72.1 |
Outstanding (in shares) | 77 | 80 | 80 |
Class of Warrant or Rights, Warrants Issued March 26, 2020 [Member] |  |  |  |
Outstanding (in shares) | 1 |  |  |
Outstanding (in shares) | 0 | 1 |  |
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 187.5 |  |  |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 187.5 |  |  |
Class Of Warrant Or Right, Expiration Date | Mar. 25, 2025 |  |  |
Outstanding (in shares) | 0 | 1 |  |
Class of Warrant or Rights, Warrants Issued March 30, 2020 [Member] |  |  |  |
Outstanding (in shares) | 2 |  |  |
Outstanding (in shares) | 0 | 2 |  |
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 140.63 |  |  |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 140.63 |  |  |
Class Of Warrant Or Right, Expiration Date | Mar. 27, 2025 |  |  |
Outstanding (in shares) | 0 | 2 |  |
Class of Warrant or Rights, Warrants Issued October 23, 2020 [Member] |  |  |  |
Outstanding (in shares) | 15 |  |  |
Outstanding (in shares) | 15 | 15 |  |
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 86.25 |  |  |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 86.25 |  |  |
Class Of Warrant Or Right, Expiration Date | Oct. 21, 2025 |  |  |
Outstanding (in shares) | 15 | 15 |  |
Class of Warrant or Rights, Warrants Issued October 28, 2020 [Member] |  |  |  |
Outstanding (in shares) | 6 |  |  |
Outstanding (in shares) | 6 | 6 |  |
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 80.63 |  |  |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 80.63 |  |  |
Class Of Warrant Or Right, Expiration Date | Oct. 28, 2025 |  |  |
Outstanding (in shares) | 6 | 6 |  |
Class of Warrant or Rights, Warrants Issued February 16, 2021 [Member] |  |  |  |
Outstanding (in shares) | 6 |  |  |
Outstanding (in shares) | 6 | 6 |  |
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 121.88 |  |  |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 121.88 |  |  |
Class Of Warrant Or Right, Expiration Date | Feb. 11, 2026 |  |  |
Outstanding (in shares) | 6 | 6 |  |
Class of Warrant or Rights, Warrants Issued April 12, 2021 [Member] |  |  |  |
Outstanding (in shares) | 50 |  |  |
Outstanding (in shares) | 50 | 50 |  |
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 56.25 |  |  |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 56.25 |  |  |
Class Of Warrant Or Right, Expiration Date | Apr. 07, 2026 |  |  |
Outstanding (in shares) | 50 | 50 |  |

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