Note 4 - Fair Value Measurements - Significant Unobservable Inputs (Details) - Fair Value, Recurring [Member] |
Dec. 31, 2025 |
Sep. 30, 2025 |
|---|---|---|
| ONCO Series D Preferred Stock [Member] | Measurement Input, Expected Term [Member] | ||
| Unobservable input | 1.2 | 1.5 |
| ONCO Series D Preferred Stock [Member] | Measurement Input, Price Volatility [Member] | ||
| Unobservable input | 0.685 | 0.725 |
| ONCO Series D Preferred Stock [Member] | Measurement Input, Discount Rate [Member] | ||
| Unobservable input | 0.25 | 0.25 |
| ONCO Series D Preferred Stock [Member] | Calibration Discount Rate [Member] | ||
| Unobservable input | 0.406 | 0.486 |
| ONCO Warrant [Member] | Measurement Input, Expected Term [Member] | ||
| Unobservable input | 2.7 | 3 |
| ONCO Warrant [Member] | Calibration Discount Rate [Member] | ||
| Unobservable input | 0.406 | 0.486 |
| ONCO Warrant [Member] | Measurement Input, Option Volatility [Member] | ||
| Unobservable input | 0.707 | 0.686 |