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Note 16 - Segments - Significant Expense Categories (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2026 | Mar. 31, 2025
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
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | 0 |  | 974,303 |  | 0 | 1,669,519
Gain (Loss) on Extinguishment of Debt | 0 |  | 0 |  | 0 | 8,624,778
Net gains (losses) recognized during the period on equity securities | 3,931,416 |  | 0 |  | 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) | $ (5,332,579) | $ (7,901,619) | $ (8,945,347) | $ (8,073,711) | $ (16,846,966)

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