Quarterly report [Sections 13 or 15(d)]

Note 9 - Stockholders' Equity (Details Textual)

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Note 9 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 23 Months Ended
May 02, 2024
Dec. 18, 2023
Dec. 13, 2023
May 12, 2023
May 02, 2023
Mar. 31, 2025
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Mar. 31, 2023
Preferred Stock, Shares Issued (in shares)           0 0     0   0   0  
Security Offering, Maximum Value of Securities, Shelf Registration                             $ 200,000,000
Security Offering, Remaining Value of Securities, Shelf Registration           $ 109,000,000 $ 109,000,000     $ 109,000,000   $ 109,000,000      
Stock Issued During Period, Value, Issued for Services             $ 98,020                
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs               $ 851 $ 164,313            
Preferred Stock, Shares Outstanding (in shares)           0 0     0   0   0  
Public Offering [Member]                              
Stock Issued During Period, Shares, New Issues (in shares)   52,708,332                          
Shares Issued, Price Per Share (in dollars per share)   $ 0.72                          
Proceeds from Issuance or Sale of Equity   $ 35,200,000               $ 0 $ 35,228,564        
Stock Issued During Period, Value, New Issues                 35,229,415            
Lincoln Park Purchase Agreement [Member]                              
Stock Issued During Period, Shares, Issued for Services (in shares) 800,000                            
Stock Issued During Period, Value, Issued for Services $ 1,000,000                            
Stock Issued During Period, Shares, New Issues (in shares)                   0 1,800,000 3,025,000      
Proceeds from Issuance or Sale of Equity                   $ 0 $ 1,661,490        
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)         225,000                    
Shares Purchase Agreement, Value, Maximum Commitment         $ 2,500,000                    
Shares Purchase Agreement, Shares, Maximum Commitment (in shares)         2,000,000                    
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)         17,678,502                    
Shares Purchase Agreement, Shares Authorized, Percentage of Common Shares Oustanding         19.99%                    
Stock Issued During Period, Value, New Issues                 1,661,490   1,700,000 $ 3,100,000      
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs                     $ 164,000        
Deferred Offering Costs 57,000                            
Deferred Costs $ 1,100,000                            
Unamortized Debt Issuance Expense           $ 870,000 $ 870,000     870,000   $ 870,000   $ 870,000  
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)         $ 6                    
Shares Purchase Agreement, Shares Authorized (in shares)         250,000                    
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)         $ 8                    
Shares Purchase Agreement, Shares Authorized (in shares)         275,000                    
Lincoln Park Purchase Agreement [Member] | Maximum [Member]                              
Shares Issued, Price Per Share (in dollars per share)         $ 0.25                    
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                        
Lincoln Park Purchase Agreement [Member] | Weighted Average [Member]                              
Shares Issued, Price Per Share (in dollars per share)         $ 1.26                    
Jefferies Sales Agreement [Member]                              
Stock Issued During Period, Shares, New Issues (in shares)                     90,156        
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   $ 67,000        
Common Stock, Capital Shares Reserved for Future Issuance (in shares)       39,609,072                      
Third Party Consultant [Member]                              
Stock Issued During Period, Shares, Issued for Services (in shares)           200,000                  
Stock Issued During Period, Value, Issued for Services           $ 98,000                  
Preferred Class A [Member]                              
Preferred Stock, Shares Authorized (in shares)           5,000,000 5,000,000     5,000,000   5,000,000      
Preferred Stock, Par or Stated Value Per Share (in dollars per share)           $ 0.01 $ 0.01     $ 0.01   $ 0.01      
Preferred Stock, Shares Issued (in shares)           0 0     0   0 0    
Preferred Stock, Shares Outstanding (in shares)           0 0     0   0 0    
Preferred Class, Series A-1 [Member]                              
Preferred Stock, Shares Authorized (in shares)           1,040,000 1,040,000     1,040,000   1,040,000      
Preferred Class, Series A-2 [Member]                              
Preferred Stock, Shares Authorized (in shares)           1,500,000 1,500,000     1,500,000   1,500,000      
Preferred Class, Series A-3 [Member]                              
Preferred Stock, Shares Authorized (in shares)           700,000 700,000     700,000   700,000      
Preferred Class, Series A-4 [Member]                              
Preferred Stock, Shares Authorized (in shares)           548,000 548,000     548,000   548,000      
Series B Preferred Stock [Member]                              
Preferred Stock, Shares Authorized (in shares)           15,000 15,000     15,000   15,000      
Preferred Stock, Par or Stated Value Per Share (in dollars per share)           $ 0.5 $ 0.5     $ 0.5   $ 0.5      
Preferred Stock, Shares Issued (in shares)           0 0     0   0 0    
Preferred Stock, Shares Outstanding (in shares)           0 0     0   0 0    
Preferred Stock [Member]                              
Stock Issued During Period, Shares, Period Increase (Decrease) (in shares)             0 0   0 0