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Note 8 - Outstanding Warrants - Fair Value Assumptions (Details) | Sep. 30, 2022 yr | Sep. 30, 2021 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 | 1.75 | 0.19
Measurement Input, Price Volatility [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 151.41 | 139.35
Measurement Input, Expected Term [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 3.52 | 2.00
Measurement Input, Exercise Price [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 10.47 | 0.01
Measurement Input, Share Price [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 11.29 | 6.83
Fair Value per Warrant on Grant Date [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 9.68 | 6.82

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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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