Note 10 - Asset Retirement Obligations - Estimated Amounts and Timing of Cash Flows and Assumptions Used for ARO Estimates (Details) |
Apr. 30, 2025 |
Jul. 31, 2024 |
|---|---|---|
| Measurement Input, Expected Term [Member] | Minimum [Member] | ||
| Asset retirement obligations, measurement input | 1 | 1 |
| Measurement Input, Expected Term [Member] | Maximum [Member] | ||
| Asset retirement obligations, measurement input | 37 | 23 |
| Measurement Input, Inflation Rate [Member] | Minimum [Member] | ||
| Asset retirement obligations, measurement input | 0.0156 | 0.0156 |
| Measurement Input, Inflation Rate [Member] | Maximum [Member] | ||
| Asset retirement obligations, measurement input | 0.0532 | 0.0532 |
| Measurement Input, Discount Rate [Member] | Minimum [Member] | ||
| Asset retirement obligations, measurement input | 0.0372 | 0.0372 |
| Measurement Input, Discount Rate [Member] | Maximum [Member] | ||
| Asset retirement obligations, measurement input | 0.0635 | 0.0635 |