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Note 10 - Share-based Compensation (Tables) | 6 Months Ended
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Mar. 31, 2026
Notes Tables |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | March 31, |  |  | March 31, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
General and administrative |  | $ | 311,852 |  |  | $ | 1,618,958 |  |  | $ | 905,058 |  |  | $ | 3,623,674 |
Research and development |  |  | 90,860 |  |  |  | 604,885 |  |  |  | 255,259 |  |  |  | 1,284,323 |
Discontinued operations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (10,049 | )
Share-based compensation |  | $ | 402,712 |  |  | $ | 2,223,843 |  |  | $ | 1,160,317 |  |  | $ | 4,897,948 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | March 31, |  |  | March 31, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Weighted Average Assumptions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected volatility |  |  | — |  |  |  | 115.5 | % |  |  | 116.6 | % |  |  | 110.2 | %
Expected dividend yield |  |  | — |  |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Risk-free interest rate |  |  | — |  |  |  | 4.1 | % |  |  | 3.8 | % |  |  | 3.6 | %
Expected term (in years) |  |  | — |  |  |  | 6.0 |  |  |  | 6.0 |  |  |  | 6.0 |
Fair value of options granted |  | $ | — |  |  | $ | 3.88 |  |  | $ | 2.20 |  |  | $ | 6.28 |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  | Weighted Average |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Remaining |  |  | Aggregate |
|  | Number of |  |  | Exercise Price |  |  | Contractual Term |  |  | Intrinsic |
|  | Shares |  |  | Per Share |  |  | (years) |  |  | Value |
Outstanding at September 30, 2025 |  |  | 1,911,020 |  |  | $ | 42.18 |  |  |  |  |  |  |  |  |
Granted |  |  | 350,700 |  |  | $ | 2.55 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Forfeited and expired |  |  | (171,742 | ) |  | $ | 40.32 |  |  |  |  |  |  |  |  |
Outstanding at March 31, 2026 |  |  | 2,089,978 |  |  | $ | 35.68 |  |  |  | 5.81 |  |  | $ | — |
Exercisable at March 31, 2026 |  |  | 1,436,000 |  |  | $ | 49.29 |  |  |  | 4.30 |  |  | $ | — |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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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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