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Note 10 - Warrants to Purchase Common Stock - Fair Value Assumptions (Details) | Sep. 30, 2025 $ / shares yr | Sep. 30, 2024 $ / 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 | 0.0399 | 0.045
Measurement Input, Price Volatility [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 0.9048 | 0.9985
Measurement Input, Expected Term [Member] |  |
Warrants and Rights Outstanding, Measurement Input | yr | 2 | 2
Measurement Input, Exercise Price [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 0.01 | 0.01
Measurement Input, Share Price [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 2.59 | 4.05
Fair Value per Warrant on Grant Date [Member] |  |
Warrants and Rights Outstanding, Measurement Input | 2.58 | 4.04

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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/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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