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Note 4 - Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2026
Notes Tables |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] |
Significant Unobservable Input |  | March 31, 2026 |  |  | September 30, 2025 |
ONCO Series D Preferred Stock |  |  |  |  |  |  |  |
Simulation Term (Years) |  |  | 1.0 |  |  |  | 1.5 |
Expected Volatility |  |  | 70.2 | % |  |  | 72.5 | %
Discount Rate |  |  | 25.0 | % |  |  | 25.0 | %
Calibration Discount |  |  | 0.0 | % |  |  | 48.6 | %
ONCO Warrant |  |  |  |  |  |  |  |
Simulation Term (Years) |  |  | 2.5 |  |  |  | 3.0 |
Equity Volatility |  |  | 72.2 | % |  |  | 68.6 | %
Calibration Discount |  |  | 0.0 | % |  |  | 48.6 | %
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
|  | Six Months Ended |
|  | March 31, |
|  | 2026 |  |  | 2025 |
ONCO Series D Preferred Stock |  |  |  |  |  |  |  |
Beginning balance |  | $ | 1,764,318 |  |  | $ | — |
Change in fair value of equity securities |  |  | 2,818,551 |  |  |  | — |
Converted into ONCO common stock |  |  | (3,218,257 | ) |  |  | — |
Ending balance |  | $ | 1,364,612 |  |  | $ | — |
ONCO Warrant |  |  |  |  |  |  |  |
Beginning balance |  | $ | 760,987 |  |  | $ | — |
Change in fair value of equity securities |  |  | 1,041,659 |  |  |  | — |
Ending balance |  | $ | 1,802,646 |  |  | $ | — |
Realized Gain (Loss) on Investments [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | March 31, |  |  | March 31, |
|  | 2026 |  |  | 2025 |  |  | 2026 |  |  | 2025 |
Net gains (losses) recognized during the period on equity securities |  | $ | 3,931,416 |  |  | $ | — |  |  | $ | 3,811,338 |  |  | $ | (349,078 | )
Less: net gains (losses) recognized during the period on equity securities sold during the period |  |  | 1,954,544 |  |  |  | — |  |  |  | 2,081,146 |  |  |  | (349,078 | )
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date |  | $ | 1,976,872 |  |  | $ | — |  |  | $ | 1,730,192 |  |  | $ | — |

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