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Note 5 - Fair Value Measurement and Fair Value of Financial Instruments - Warrant Liabilities Inputs and Assumptions (Details)
Sep. 30, 2024
Sep. 30, 2023
Montage Warrant [Member] | Measurement Input, Price Volatility [Member]    
Warrants and rights, measurement input 0.51 0.517
Montage Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member]    
Warrants and rights, measurement input 0.048 0.055
Montage Warrant [Member] | Measurement Input, Share Price [Member]    
Warrants and rights, measurement input 1.15 0.83
Series C Warrants [Member] | Measurement Input, Price Volatility [Member]    
Warrants and rights, measurement input 0.525 0.736
Series C Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]    
Warrants and rights, measurement input 0.037 0.048
Series C Warrants [Member] | Measurement Input, Share Price [Member]    
Warrants and rights, measurement input 1.15 0.83
Series D Warrants [Member] | Measurement Input, Price Volatility [Member]    
Warrants and rights, measurement input 0.607  
Series D Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]    
Warrants and rights, measurement input 0.05  
Series D Warrants [Member] | Measurement Input, Share Price [Member]    
Warrants and rights, measurement input 0.83