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Note 8 - Warrants - Fair Value Assumptions (Details) | Sep. 30, 2023 $ / shares yr | Sep. 30, 2022 $ / shares yr
--- | --- | ---
Measurement Input, Expected Dividend Rate [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 0 | 0
Measurement Input, Risk Free Interest Rate [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 0.038 | 0.0175
Measurement Input, Price Volatility [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 1.176 | 1.5141
Measurement Input, Expected Term [Member] |  |
Warrants and Rights Outstanding, Measurement Input | yr | 4.63 | 3.52
Measurement Input, Exercise Price [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 1.18 | 10.47
Measurement Input, Share Price [Member] |  |
Warrants and Rights Outstanding, Measurement Input | $ / shares | 4.11 | 11.29
Fair Value per Warrant on Grant Date [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 3.97 | 9.68

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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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