Note 4 - Fair Value Measurement and Fair Value of Financial Instruments - Warrant Liabilities Inputs and Assumptions (Details) |
Jun. 30, 2026 |
Sep. 30, 2025 |
|---|---|---|
| Montage Warrant [Member] | Measurement Input, Price Volatility [Member] | ||
| Warrants and rights, measurement input | 0.687 | 0.721 |
| Montage Warrant [Member] | Measurement Input, Risk Free Interest Rate [Member] | ||
| Warrants and rights, measurement input | 0.035 | 0.037 |
| Montage Warrant [Member] | Measurement Input, Share Price [Member] | ||
| Warrants and rights, measurement input | 1.16 | 1.32 |
| Series D Warrants [Member] | Measurement Input, Price Volatility [Member] | ||
| Warrants and rights, measurement input | 0.51 | |
| Series D Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member] | ||
| Warrants and rights, measurement input | 0.048 | |
| Series D Warrants [Member] | Measurement Input, Share Price [Member] | ||
| Warrants and rights, measurement input | 1.32 |