Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Stockholders' Equity (Details Textual)

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Note 9 - Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 14 Months Ended 15 Months Ended
Dec. 18, 2023
Dec. 13, 2023
May 12, 2023
May 02, 2023
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Preferred Stock, Shares Issued (in shares)         0         0   0 0 0 0
Preferred Stock, Shares Outstanding (in shares)         0         0   0 0 0 0
Security Offering, Maximum Value of Securities, Shelf Registration                 $ 200,000,000            
Security Offering, Remaining Value of Securities, Shelf Registration         $ 35,100,000         $ 35,100,000   $ 35,100,000 $ 35,100,000 $ 35,100,000  
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs           $ 851 $ 164,313 $ 26,172 $ 78,677            
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 of Common Stock $ 35,200,000                            
Stock Issued During Period, Value, New Issues             35,229,415                
Lincoln Park Purchase Agreement [Member]                              
Stock Issued During Period, Shares, New Issues (in shares)                   1,800,000   3,025,000      
Shares Purchase Agreement, Value, Shares Authorized   $ 50,000,000   $ 100,000,000                      
Share Purchase Agreement, Term (Month)       36 months                      
Share Purchase Agreement, Value, Minimum Shares to be Sold   50,000,000                          
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 $ 1,008,000   $ 1,700,000   $ 3,100,000      
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs                   $ 164,000          
Stock Issued During Period, Shares, Issued for Services (in shares)                   800,000          
Stock Issued During Period, Value, Issued for Services                   $ 1,000,000          
Deferred Offering Costs       $ 57,000                      
Deferred Costs       $ 1,100,000                      
Unamortized Debt Issuance Expense         870,000         $ 870,000   870,000 $ 870,000 870,000 $ 1,000,000
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 Purchase Agreement, Value, Shares Authorized   $ 50,000,000   $ 100,000,000                      
Lincoln Park Purchase Agreement [Member] | Minimum [Member]                              
Shares Issued, Price Per Share (in dollars per share)       $ 0.25                      
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     1,367,415    
Shares Purchase Agreement, Value, Shares Authorized     $ 75,000,000                        
Stock Issued During Period, Value, New Issues             $ 66,551     $ 67,000     $ 1,100,000    
Deferred Offering Costs     $ 207,000                        
Unamortized Debt Issuance Expense         $ 204,000         $ 204,000   $ 204,000 $ 204,000 $ 204,000 $ 204,000
Common Stock, Capital Shares Reserved for Future Issuance (in shares)     39,609,072                        
Shares Purchase Agreement, Sales Commission, Percent     3.00%                        
Preferred Class A [Member]                              
Preferred Stock, Shares Authorized (in shares)         5,000,000         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 $ 0.01  
Preferred Stock, Shares Issued (in shares)         0         0   0 0 0 0
Preferred Stock, Shares Outstanding (in shares)         0         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 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 1,500,000  
Preferred Class, Series A-3 [Member]                              
Preferred Stock, Shares Authorized (in shares)         700,000         700,000   700,000 700,000 700,000  
Preferred Class, Series A-4 [Member]                              
Preferred Stock, Shares Authorized (in shares)         548,000         548,000   548,000 548,000 548,000  
Series B Preferred Stock [Member]                              
Preferred Stock, Shares Authorized (in shares)         15,000         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 $ 0.5  
Preferred Stock, Shares Issued (in shares)         0         0   0 0 0 0
Preferred Stock, Shares Outstanding (in shares)         0         0   0 0 0 0
Preferred Stock [Member]                              
Stock Issued During Period, Shares, Period Increase (Decrease) (in shares)         0         0 0     0