Annual report [Section 13 and 15(d), not S-K Item 405]

Note 9 - Stockholders' Equity (Details Textual)

v3.25.3
Note 9 - Stockholders' Equity (Details Textual)
 12 Months Ended
Aug. 08, 2025
Aug. 05, 2025
May 02, 2024
USD ($)
shares
Dec. 18, 2023
USD ($)
$ / shares
shares
Dec. 13, 2023
USD ($)
May 12, 2023
USD ($)
shares
May 02, 2023
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Mar. 31, 2023
USD ($)
Preferred Stock, Shares Issued (in shares)               0 0  
Common Stock, Shares Authorized (in shares)               308,000,000 308,000,000  
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares               $ 0.01 $ 0.01  
Stock Issued During Period, Value, Issued for Services | $               $ 58,812    
Security Offering, Maximum Value of Securities, Shelf Registration | $                   $ 200,000,000
Security Offering, Remaining Value of Securities, Shelf Registration | $               $ 109,000,000    
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | $                 $ 164,313  
Preferred Stock, Shares Outstanding (in shares)               0 0  
Reverse Stock Split [Member]                    
Stockholders' Equity Note, Stock Split, Conversion Ratio 10 10                
Public Offering [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)       5,270,833            
Shares Issued, Price Per Share (in dollars per share) | $ / shares       $ 7.2            
Proceeds from Issuance or Sale of Equity | $       $ 35,200,000       $ 0 $ 35,228,564  
Stock Issued During Period, Value, New Issues | $                 $ 35,228,564  
Lincoln Park Purchase Agreement [Member]                    
Stock Issued During Period, Shares, Issued for Services (in shares)     80,000              
Stock Issued During Period, Value, Issued for Services | $     $ 1,000,000              
Stock Issued During Period, Shares, New Issues (in shares)               0 180,000  
Shares Purchase Agreement, Value, Shares Authorized | $         $ 50,000,000   $ 100,000,000      
Share Purchase Agreement, Term (Month)             36 months      
Shares Purchase Agreement, Shares Authorized (in shares)             22,500      
Shares Purchase Agreement, Value, Maximum Commitment | $             $ 2,500,000      
Shares Purchase Agreement, Shares, Maximum Commitment (in shares)             200,000      
Shares Purchase Agreement, Accelerated Purchase Date, Percent Of Trading Volume             30.00%      
Shares Purchase Agreement, Accelerated Purchase Date, Purchase Price, Percent             97.00%      
Shares Purchase Agreement, Shares Authorized, Aggregate Maximum (in shares)             1,767,850      
Shares Purchase Agreement, Shares Authorized, Percentage of Common Shares Oustanding             19.99%      
Deferred Offering Costs | $     57,000              
Deferred Costs | $     1,100,000              
Stock Issued During Period, Value, New Issues | $                 $ 1,700,000  
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs | $                 200,000  
Unamortized Debt Issuance Expense | $               $ 900,000 $ 900,000  
Lincoln Park Purchase Agreement [Member] | Shares Required to be Purchased if Closing Price is $6.00 or Above [Member]                    
Shares Issued, Price Per Share (in dollars per share) | $ / shares             $ 60      
Shares Purchase Agreement, Shares Authorized (in shares)             25,000      
Lincoln Park Purchase Agreement [Member] | Shares Required to be Purchased if Closing Price is $8.00 or Above [Member]                    
Shares Issued, Price Per Share (in dollars per share) | $ / shares             $ 80      
Shares Purchase Agreement, Shares Authorized (in shares)             27,500      
Lincoln Park Purchase Agreement [Member] | Maximum [Member]                    
Shares Purchase Agreement, Value, Shares Authorized | $         50,000,000   $ 100,000,000      
Lincoln Park Purchase Agreement [Member] | Minimum [Member]                    
Shares Purchase Agreement, Value, Shares Authorized | $     $ 50,000,000   $ 50,000,000          
Lincoln Park Purchase Agreement [Member] | Weighted Average [Member]                    
Shares Issued, Price Per Share (in dollars per share) | $ / shares             $ 12.6      
Jefferies Sales Agreement [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)               0 9,016  
Proceeds from Issuance or Sale of Equity | $               $ 0 $ 66,551  
Shares Purchase Agreement, Value, Shares Authorized | $           $ 75,000,000        
Stock Issued During Period, Value, New Issues | $                 66,551  
Unamortized Debt Issuance Expense | $                 200,000  
Common Stock, Capital Shares Reserved for Future Issuance (in shares)           3,960,907        
Payments of Stock Issuance Costs | $                 $ 200,000  
Third Party Consultant [Member]                    
Stock Issued During Period, Shares, Issued for Services (in shares)               12,000    
Stock Issued During Period, Value, Issued for Services | $               $ 59,000    
Preferred Class A [Member]                    
Preferred Stock, Shares Authorized (in shares)               5,000,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares               $ 0.01    
Preferred Stock, Shares Issued (in shares)               0 0  
Preferred Stock, Shares Outstanding (in shares)               0 0  
Preferred Class, Series A-1 [Member]                    
Preferred Stock, Shares Authorized (in shares)               1,040,000    
Preferred Class, Series A-2 [Member]                    
Preferred Stock, Shares Authorized (in shares)               1,500,000    
Preferred Class, Series A-3 [Member]                    
Preferred Stock, Shares Authorized (in shares)               700,000    
Preferred Class, Series A-4 [Member]                    
Preferred Stock, Shares Authorized (in shares)               548,000    
Series B Preferred Stock [Member]                    
Preferred Stock, Shares Authorized (in shares)               15,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares               $ 0.5    
Preferred Stock, Shares Issued (in shares)               0 0  
Preferred Stock, Shares Outstanding (in shares)               0 0