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Note 4 - Fair Value Measurement and Fair Value of Financial Instruments - Warrant Liabilities Inputs and Assumptions (Details)
Dec. 31, 2022
Sep. 30, 2022
Montage Warrant [Member] | Measurement Input, Price Volatility [Member]    
Volatility 0.814 0.820
Montage Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member]    
Volatility 0.0430 0.0420
Montage Warrant [Member] | Measurement Input, Share Price [Member]    
Volatility 1.05 1.31
Series C Warrants [Member] | Measurement Input, Price Volatility [Member]    
Volatility 0.834 0.839
Series C Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]    
Volatility 0.0450 0.0420
Series C Warrants [Member] | Measurement Input, Share Price [Member]    
Volatility 1.05 1.31
Series D Warrants [Member] | Measurement Input, Price Volatility [Member]    
Volatility 0.808 0.847
Series D Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]    
Volatility 0.0412 0.0410
Series D Warrants [Member] | Measurement Input, Share Price [Member]    
Volatility 1.05 1.31