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Note 8 - Stockholders' Equity - Schedule of Warrant Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
Outstanding (in shares) | 80 | 80 |
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 72.10 | $ 72.10 |
Outstanding, Aggregate Fair Market Value | $ 3,747 | $ 3,747 | $ 3,747
Outstanding, Weighted Average Remaining Contractual Term (Year) | 2 years 7 months 6 days | 3 years 7 months 6 days | 4 years 7 months 17 days
Issued (in shares) |  | 0 |
Warrants Issued (in dollars per share) |  | $ 0 |
Issued |  | $ 0 |
Outstanding (in shares) | 80 | 80 | 80
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 72.10 | $ 72.10 | $ 72.10
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 72.10 | $ 72.10 | $ 72.10
Outstanding (in shares) | 80 | 80 | 80
Class of Warrant or Rights, Warrants Issued March 26, 2020 [Member] |  |  |
Outstanding (in shares) | 1 |  |
Outstanding (in shares) | 1 | 1 |
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 187.50 |  |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 187.50 |  |
Outstanding (in shares) | 1 | 1 |
Class of Warrant or Rights, Warrants Issued March 30, 2020 [Member] |  |  |
Outstanding (in shares) | 2 |  |
Outstanding (in shares) | 2 | 2 |
Warrants Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 140.63 |  |
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ 140.63 |  |
Outstanding (in shares) | 2 | 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 |  |
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 |  |
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 |  |
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 |  |
Outstanding (in shares) | 50 | 50 |

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