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Note 1 - Nature of Operations (Details Textual) - USD ($)
$ in Thousands
2 Months Ended
Sep. 28, 2023
Jul. 31, 2023
Jul. 31, 2022
Jul. 31, 2021
Working Capital   $ 43,011    
Cash and Cash Equivalents, at Carrying Value   45,614 $ 32,536 $ 44,313
Inventory, Net   6,207 $ 66,570  
Subsequent Event [Member] | At-the-market Offering [Member]        
Proceeds from Issuance or Sale of Equity $ 36,217      
Uranium Inventory [Member]        
Inventory, Net   $ 5,801