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Note 3 - Inventories - Costs of Inventories (Details) - USD ($) | Jul. 31, 2021 | Jul. 31, 2020
--- | --- | ---
Supplies and work-in-progress | $ 33,781 | $ 33,781
Inventory, Net, Total | 29,172,480 | 211,662
Uranium Inventory [Member] |  |
Uranium concentrates from production | 177,881 | 177,881
Purchased uranium inventories | $ 28,960,818 |

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