v3.25.1
Note 8 - Warrants and Other Derivative Liabilities and Fair Value Measurements (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
May 14, 2024
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Class of Warrant or Right, Outstanding (in shares)   462,864.4   462,864.4    
Warrants and Rights Outstanding   $ 95,700,233   $ 95,700,233    
Gain (Loss) on Exchange of Warrants   (57,770,454) $ 0 (57,770,454) $ 0  
Financing Costs, Initial Recognition of Warrants   $ 21,105,570 $ (0) 37,184,192 $ (0)  
Class of Warrant or Right, Exercised During Period, Fair Value       $ 46,000,000    
Stock Issued During Period, Shares, Warrant Exercies (in shares)       886,216    
Stock Issued During Period, Shares, Shares Issuance Liability Upon Warrants Exercised (in shares)       208,040    
Stock Issued During Period, Value, Shares Issuance Liability Upon Warrants Exercised       $ 2,400,000    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   9,114,308   9,114,308    
Secured Promissory Notes [Member]            
Debt Instrument, Face Amount $ 50,000,000          
Senior Secured Convertible Notes Warrants [Member]            
Warrants and Rights Outstanding, Term (Year) 5 years          
Warrants and Rights, Value, Conversion Price, Percent 200.00%          
Class of Warrants or Rights, Exercise Price, Closing Share Price Percentage 105.00%          
Beneficial Owner, Ownership Percentage 9.90% 9.90%   9.90%    
Warrants and Rights, Exercise Price, Conversion Price, Percent 250.00%          
Warrants Issued (in shares) 40          
Class of Warrant or Right, Outstanding (in shares)           29
Warrants and Rights Outstanding           $ 79,700,000
Proceeds from Issuance of Warrants       $ 33,000,000    
Class of Warrant or Right, Issued During Period, Fair Value       70,200,000    
Financing Costs, Initial Recognition of Warrants       $ 37,200,000    
Senior Secured Convertible Notes Warrants [Member] | Measurement Input, Price Volatility [Member]            
Warrants and Rights Outstanding, Measurement Input 1.35          
New Exchanged Warrants [Member]            
Warrants and Rights Outstanding, Term (Year)   5 years   5 years    
Class of Warrant or Right, Exercise Floor Price, Cashless Exercise (in dollars per share)   $ 0.01   $ 0.01    
Gain (Loss) on Exchange of Warrants   $ (57,800,000)        
Cashless Basis Warrants [Member]            
Class of Warrant or Right, Outstanding (in shares)   462,864.4   462,864.4    
Warrants and Rights Outstanding   $ 95,700,000   $ 95,700,000    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   9,114,308   9,114,308    
Cashless Basis Warrants [Member] | Minimum [Member]            
Warrants and Rights Outstanding, Term (Year)   4 years 6 months   4 years 6 months    
Cashless Basis Warrants [Member] | Maximum [Member]            
Warrants and Rights Outstanding, Term (Year)   5 years   5 years