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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

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/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

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