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Note 5 - Fair Value Measurement and Fair Value of Financial Instruments - Warrant Liabilities Inputs and Assumptions (Details)
Sep. 30, 2022
Sep. 30, 2021
May 14, 2021
Montage Warrant [Member] | Measurement Input, Price Volatility [Member]      
Volatility 0.820 0.887  
Montage Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member]      
Volatility 0.0420 0.0080  
Montage Warrant [Member] | Measurement Input, Share Price [Member]      
Volatility 1.31 4.11  
Series C Warrants [Member] | Measurement Input, Price Volatility [Member]      
Volatility 0.839 0.839  
Series C Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]      
Volatility 0.0420 0.0050  
Series C Warrants [Member] | Measurement Input, Share Price [Member]      
Volatility 1.31 4.11  
Series D Warrants [Member] | Measurement Input, Price Volatility [Member]      
Volatility 0.847 0.857 0.863
Series D Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]      
Volatility 0.0410 0.0100 0.0090
Series D Warrants [Member] | Measurement Input, Share Price [Member]      
Volatility 1.31 4.11 2.50