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Note 5 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions | Mar. 31, 2024 | Jun. 30, 2023 | Dec. 21, 2022 | Nov. 09, 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 |  |
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) | 72.1 | $ 72.1 |  |
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 |
Share Repurchase Program Authorized November 2022 [Member] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 1
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 |  |  |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
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