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Note 8 - Stockholders' Equity (Details Textual) | Dec. 19, 2022 $ / shares | Dec. 05, 2022 $ / shares shares | Jun. 30, 2023 USD ($) $ / shares shares | Dec. 21, 2022 $ / shares shares | Nov. 09, 2022 USD ($) | Jun. 30, 2022 USD ($) $ / shares shares | Jun. 30, 2021 $ / shares
--- | --- | --- | --- | --- | --- | --- | ---
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.001 | $ 0.001 |  |  | $ 0.001 |
Preferred Stock, Shares Issued (in shares) | shares |  |  | 280,898 |  |  | 280,898 |
Treasury Stock, Common, Shares (in shares) | shares |  |  | 10,316 |  |  | 0 |
Treasury Stock, Common, Value | $ |  |  | $ 119,000 |  |  | $ (0) |
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) |  |  | $ 72.10 |  |  | $ 72.10 | $ 72.10
Stock Issued During Period, Shares, Reverse Stock Splits (in shares) | shares |  | 0 |  |  |  |  |
Equity Securities, Minimum Closing Bid Price (in dollars per share) | $ 1.00 |  |  |  |  |  |
Equity Securities, Threshold Consecutive Trading Days (Day) | 10 days |  |  |  |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  | 30 |  |  |  |  |
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) |  |  |  | $ 58.00 |  |  |
Share Repurchase Program Authorized November 2022 [Member] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ |  |  |  |  | $ 1,000,000.0 |  |
Treasury Stock, Common, Shares (in shares) | shares |  |  | 10,316 |  |  |  |
Treasury Stock, Common, Value | $ |  |  | $ 118,532 |  |  |  |
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 |  |  |  |

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