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Note 3 - Inventories (Details Textual)
12 Months Ended
Oct. 27, 2021
USD ($)
lb
Jul. 31, 2021
USD ($)
lb
Jul. 31, 2020
USD ($)
Increase (Decrease) in Inventories, Total | $   $ 28,960,818
Uranium Inventory [Member]      
Increase in Purchase Obligations, Mass (Pound)   3,700,000  
Inventory, Increase from Purchases, Mass (Pound)   1,000,000  
Uranium Inventory [Member] | Subsequent Event [Member]      
Increase in Purchase Obligations, Mass (Pound) 400,000    
Inventory, Increase from Purchases, Mass (Pound) 200,000    
Increase (Decrease) in Inventories, Purchase Obligation | $ $ 14,500,000    
Increase (Decrease) in Inventories, Total | $ $ 6,980,000