Note 11 - Share-based Compensation - Composition of Stock-based Compensation Expense (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Share-based Payment Arrangement, Expense | $ 23,680,269 | $ 1,705,859 | $ 42,272,019 | $ 15,609,276 |
| Chief Executive Officer [Member] | ||||
| Share-based Payment Arrangement, Expense | (1,205,545) | (6,240,510) | (543,454) | (6,065,658) |
| Employees and Directors [Member] | ||||
| Share-based Payment Arrangement, Expense | 12,051,919 | 3,487,105 | 16,723,381 | 5,473,641 |
| Consultants [Member] | Equity Classified Awards [Member] | ||||
| Share-based Payment Arrangement, Expense | 854,286 | 206,025 | 4,347,207 | 1,272,573 |
| Consultants [Member] | Liability Classified Awards [Member] | ||||
| Share-based Payment Arrangement, Expense | $ 11,979,609 | $ 4,253,239 | $ 21,744,885 | $ 14,928,720 |