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Note 16 - Segments (Tables) | 6 Months Ended
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Mar. 31, 2026
Notes Tables |
Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | March 31, |  |  | March 31, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development |  | $ | 3,145,783 |  |  |  | 3,932,102 |  |  |  | 4,489,965 |  |  | $ | 9,648,932 |
General and administrative |  |  | 4,073,185 |  |  |  | 5,164,433 |  |  |  | 8,153,018 |  |  |  | 10,391,546 |
Total operating expenses |  |  | 7,218,968 |  |  |  | 9,096,535 |  |  |  | 12,642,983 |  |  |  | 20,040,478 |
Other segment items: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of ENTADFI® assets |  |  | — |  |  |  | 974,303 |  |  |  | — |  |  |  | 1,669,519 |
Gain on extinguishment of debt |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 8,624,778 |
Change in fair value of equity securities |  |  | 3,931,416 |  |  |  | — |  |  |  | 3,811,338 |  |  |  | (349,078 | )
Other income, net |  |  | 195,002 |  |  |  | 269,839 |  |  |  | 406,516 |  |  |  | 432,963 |
Net income (loss) from discontinued operations, net of taxes |  |  | 351,418 |  |  |  | (49,226 | ) |  |  | 351,418 |  |  |  | (7,184,670 | )
Net loss |  | $ | (2,741,132 | ) |  |  | (7,901,619 | ) |  |  | (8,073,711 | ) |  | $ | (16,846,966 | )
Segment Reporting, Reconciliation of Asset by Segment to Consolidated [Table Text Block] |
|  | 2026 |  |  | 2025 |
Cash, cash equivalents and restricted cash |  | $ | 27,596,820 |  |  | $ | 15,794,562 |

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