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Note 11 - Asset Retirement Obligations (Tables) | 12 Months Ended
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Jul. 31, 2021
Notes Tables |
Schedule of Change in Asset Retirement Obligation [Table Text Block] |
Balance, July 31, 2020 |  | $ | 3,734,314 |
Accretion |  |  | 204,341 |
Balance, July 31, 2021 |  | $ | 3,938,655 |
Schedule Of Estimated Cash flow and Assumption Used For ARO [Table Text Block] |
|  | July 31, 2021 |  |  | July 31, 2020 |
Undiscounted amount of estimated cash flows |  | $ |  | 8,221,018 |  |  | $ |  | 8,221,018 |
Payable in years |  | 9 | to | 21 |  |  | 9 | to | 21 |
Inflation rate |  | 1.56% | to | 2.17% |  |  | 1.56% | to | 2.17% |
Discount rate |  | 5.50% | to | 5.96% |  |  | 5.50% | to | 5.96% |
Schedule Of Undiscounted Amounts Of Estimated Cash Flows [Table Text Block] |
Fiscal 2022 |  | $ | - |
Fiscal 2023 |  |  | - |
Fiscal 2024 |  |  | - |
Fiscal 2025 |  |  | - |
Fiscal 2026 |  |  | - |
Remaining balance |  |  | 8,221,018 |
|  | $ | 8,221,018 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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