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Note 3 - Inventories - Uranium Inventory Purchase Commitments (Details) - Uranium Inventory [Member]
Jul. 31, 2021
USD ($)
lb
Fiscal 2022 (Pound) | lb 600,000
Fiscal 2022 | $ $ 18,065,000
Fiscal 2023 (Pound) | lb 1,205,000
Fiscal 2023 | $ $ 39,409,000
Fiscal 2024 (Pound) | lb 495,000
Fiscal 2024 | $ $ 16,913,250
Fiscal 2025 (Pound) | lb 400,000
Fiscal 2025 | $ $ 14,130,000
Fiscal 2026 (Pound) | lb
Fiscal 2026 | $
Total, mass (Pound) | lb 2,700,000
Total | $ $ 88,517,250