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Note 5 - Stockholders' Equity (Details Textual) - USD ($) | Dec. 19, 2022 | Mar. 31, 2023 | Dec. 21, 2022 | Nov. 09, 2022 | Jun. 30, 2022
--- | --- | --- | --- | --- | ---
Common Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.001 |  |  | $ 0.001 |
Preferred Stock, Shares Issued (in shares) |  | 280,898 |  |  | 280,898 | [1]
Treasury Stock, Common, Shares (in shares) |  | 5,821 |  |  | 0 |
Treasury Stock, Common, Value |  | $ 69,000 |  |  | $ (0) |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  | $ 0.001 |  |  | $ 0.001 | [1]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 72.10 |  |  | $ 72.10 |
Equity Securities, Minimum Closing Bid Price (in dollars per share) | $ 1.00 |  |  |  |  |
Equity Securities, Threshold Consecutive Trading Days (Day) | 10 days |  |  |  |  |
Rights Plan [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in 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) |  | 5,821 |  |  |  |
Treasury Stock, Common, Value |  | $ 69,070 |  |  |  |
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) |  | 280,898 |  |  |  |
[1] | The balance sheet at June 30, 2022, has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by the United States generally accepted accounting principles for complete financial statements.

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