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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
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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

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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