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Note 7 - Stockholders' Equity (Details Textual) - $ / shares | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Dec. 21, 2022
Preferred Stock, Shares Issued (in shares) | 280,898 | 280,898 |
Common Stock, Shares, Issued (in shares) | 1,769,269 | 1,769,269 |
Common Stock, Shares, Outstanding (in shares) | 1,758,953 | 1,701,729 |
Treasury Stock, Common, Shares (in shares) | 10,316 | 10,316 |
Stock Issued During Period, Shares, New Issues (in shares) | 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) | $ 69.04 | $ 69.04 |
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
Series D Preferred Stock [Member] |  |  |
Preferred Stock, Shares Issued (in shares) |  | 280,898 |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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