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Note 4 - Fair Value Measurement and Fair Value of Financial Instruments - Warrant Liabilities Inputs and Assumptions (Details) | Dec. 31, 2023 | Sep. 30, 2023
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Montage Warrant [Member] | Measurement Input, Price Volatility [Member] |  |
Volatility | 0.568 | 0.607
Montage Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |
Volatility | 0.044 | 0.05
Montage Warrant [Member] | Measurement Input, Share Price [Member] |  |
Volatility | 0.87 | 0.83
Series C Warrants [Member] | Measurement Input, Price Volatility [Member] |  |
Volatility | 0.493 | 0.517
Series C Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |
Volatility | 0.051 | 0.055
Series C Warrants [Member] | Measurement Input, Share Price [Member] |  |
Volatility | 0.87 | 0.83
Series D Warrants [Member] | Measurement Input, Price Volatility [Member] |  |
Volatility | 0.721 | 0.736
Series D Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |
Volatility | 0.04 | 0.048
Series D Warrants [Member] | Measurement Input, Share Price [Member] |  |
Volatility | 0.87 | 0.83

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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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