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Note 4 - Inventories - Uranium Inventory Purchase Commitments (Details) - Uranium Inventory [Member]
Apr. 30, 2021
USD ($)
lb
Fiscal 2021, mass (Pound) | lb 100,000
Fiscal 2021 | $ $ 2,745,000
Fiscal 2022, mass (Pound) | lb 600,000
Fiscal 2022 | $ $ 18,065,000
Fiscal 2023, mass (Pound) | lb 705,000
Fiscal 2023 | $ $ 22,674,000
Total, mass (Pound) | lb 1,405,000
Total | $ $ 43,484,000