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Note 7 - Inventories - Uranium Inventory Purchase Commitments (Details) - Uranium Inventory [Member]
$ in Thousands
Jul. 31, 2023
lb
Jul. 31, 2022
USD ($)
Fiscal 2024 (Pound) | lb 995,000  
Fiscal 2024 | $   $ 45,777
Fiscal 2025 (Pound) | lb 600,000  
Fiscal 2025 | $   23,120
Fiscal 2026 (Pound) | lb 100,000  
Fiscal 2026 | $   3,620
Total, mass (Pound) | lb 1,695,000  
Total | $   $ 72,517