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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