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Note 8 - Shareholders' Equity - Fair Value Assumptions of Stock Options (Details) - Share-Based Payment Arrangement, Option [Member] - $ / shares | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Weighted average exercise price (in dollars per share) | $ 0.54 |
Risk free interest rate | 4.00% |
Volatility | 107.00% |
Expected term (in years) (Year) | 2 years 6 months |
Minimum [Member] |  |
Weighted average exercise price (in dollars per share) |  | $ 10.35
Risk free interest rate |  | 3.93%
Volatility |  | 106.48%
Expected term (in years) (Year) |  | 2 years 6 months
Maximum [Member] |  |
Weighted average exercise price (in dollars per share) |  | $ 12.6
Risk free interest rate |  | 4.71%
Volatility |  | 106.51%
Expected term (in years) (Year) |  | 4 years

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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Rate of weighted-average expected volatility for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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