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Note 7 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions | Nov. 22, 2022 | Jun. 30, 2025 $ / shares shares | Jun. 30, 2024 $ / shares shares | Jun. 30, 2023 $ / shares | Dec. 21, 2022 $ / shares shares | Nov. 09, 2022 USD ($)
--- | --- | --- | --- | --- | --- | ---
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.001 | $ 0.001 |  |  |
Preferred Stock, Shares Issued (in shares) | shares |  | 280,898 | 280,898 |  |  |
Share Repurchase Program, Authorized, Amount | $ |  |  |  |  |  | $ 1
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.001 | $ 0.001 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | 69.04 | $ 72.1 | $ 72.1 |  |
Rights Plan [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares |  |  |  |  | 1 |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  |  | $ 0.001 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  | $ 58 |
Series D Preferred Stock [Member] |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.001 |  |  |  |
Preferred Stock, Shares Issued (in shares) | shares |  | 280,898 |  |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 30 |  |  |  |  |

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