v3.26.1
Note 8 - Stockholders' Equity (Details Textual) - USD ($)
 9 Months Ended
Mar. 31, 2026
Jan. 28, 2026
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   1,758,953  
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) $ 56.25   $ 69.04  
Preferred Stock, Shares Outstanding (in shares) 280,898   280,898  
Shelf Registration [Member]        
Sale of Equity, Maximum Amount   $ 30,000,000    
Sale of Equity, Public Float Limitation Amount   75,000,000    
Sale of Common Stock, Maximum Calculated Amount   $ 1,974,354    
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      
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) 9,363      
Preferred Stock, Shares Outstanding (in shares) 280,898