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Note 4 - Fair Value Measurement and Fair Value of Financial Instruments - Warrant Liabilities Inputs and Assumptions (Details)	Jun. 30, 2022	Sep. 30, 2021
Montage Warrant [Member] | Measurement Input, Price Volatility [Member]
Volatility	0.827	0.887
Montage Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member]
Volatility	0.0300	0.0080
Montage Warrant [Member] | Measurement Input, Share Price [Member]
Volatility	1.20	4.11
Series C Warrants [Member] | Measurement Input, Price Volatility [Member]
Volatility	0.843	0.839
Series C Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Volatility	0.0290	0.0050
Series C Warrants [Member] | Measurement Input, Share Price [Member]
Volatility	1.20	4.11
Series D Warrants [Member] | Measurement Input, Price Volatility [Member]
Volatility	0.889	0.857
Series D Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Volatility	0.0300	0.0100
Series D Warrants [Member] | Measurement Input, Share Price [Member]
Volatility	1.20	4.11

X

- 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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Balance Type:	na
Period Type:	instant

X

- Details

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- Details

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- Details

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- Details

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