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Note 8 - Shareholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2024
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2024 |  |  | 2023 |
Weighted average exercise price |  | $ | 0.54 |  |  |  | 10.35 - 12.60 |
Risk free interest rate |  |  | 4% |  |  |  | 3.93% - 4.71% |
Volatility |  |  | 107% |  |  |  | 106.48% - 106.51% |
Expected term (in years) |  |  | 2.5 |  |  |  | 2.5 - 4 |
Dividend yield |  | None |  |  | None |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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