v3.26.3
Note 7 - Stockholders' Equity (Details Textual)
 1 Months Ended 12 Months Ended
Nov. 22, 2022
$ / shares
Sep. 23, 2026
USD ($)
shares
Jun. 30, 2026
USD ($)
$ / shares
shares
Aug. 19, 2026
USD ($)
Jun. 03, 2026
USD ($)
Jan. 28, 2026
USD ($)
Jun. 30, 2025
$ / shares
shares
Jun. 30, 2024
$ / shares
Dec. 21, 2022
$ / shares
shares
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.001       $ 0.001    
Preferred Stock, Shares Issued (in shares)     280,898       280,898    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 0       $ 69.04 $ 72.1  
Preferred Stock, Shares Outstanding (in shares)     280,898       280,898    
Shelf Registration [Member]                  
Sale of Equity, Maximum Amount | $     $ 200,000,000     $ 30,000,000      
At-the-market (ATM) Issuances [Member]                  
Sale of Equity, Maximum Amount | $         $ 24,400,000        
Stock Issued During Period, Value, New Issues | $     $ 6,687            
At-the-market (ATM) Issuances [Member] | Subsequent Event [Member]                  
Equity Offering, Maximum Offering Amount | $       $ 50,000,000          
Stock Issued During Period, Shares, New Issues (in shares)   258,856              
Stock Issued During Period, Value, New Issues | $   $ 7,900,000              
Rights Plan [Member]                  
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares                 $ 0.001
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                 1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares                 $ 58
Series D Preferred Stock [Member]                  
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.001                
Preferred Stock, Shares Issued (in shares)     280,898            
Preferred Stock, Convertible, Shares Issuable (in shares)     9,363            
Preferred Stock, Shares Outstanding (in shares)     280,898            
Reverse Stock Split [Member]                  
Stockholders' Equity Note, Stock Split, Conversion Ratio 30