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Note 4 - Notes Receivable (Details Textual)
$ in Thousands
Jul. 27, 2021
USD ($)
Jul. 27, 2018
USD ($)
May 31, 2022
USD ($)
yr
Feb. 28, 2022
Note Receivable Upon Completion of Galore Creek Project Pre-feasibility [Member]        
Financing Receivable, after Allowance for Credit Loss, Total   $ 75,000 $ 75,000  
Proceeds from Collection of Notes Receivable $ 75,000      
Note Receivable Upon Completion of Galore Creek Project Feasibility [Member]        
Financing Receivable, after Allowance for Credit Loss, Total   25,000 25,000  
Notes Receivable, Fair Value Disclosure     23,991  
Financing Receivable, Accumulated Accretion     $ 3,044  
Note Receivable Upon Completion of Galore Creek Project Feasibility [Member] | Measurement Input, Expected Term [Member]        
Notes Receivable, Measurement Input (Year) | yr     5  
Note Receivable Upon Completion of Galore Creek Project Feasibility [Member] | Measurement Input, Discount Rate [Member]        
Notes Receivable, Measurement Input (Year)       0.036
Note Receivable Upon Approval of Galore Creek Project Construction Plan [Member]        
Financing Receivable, after Allowance for Credit Loss, Total   75,000    
Notes Receivable, Fair Value Disclosure   0    
Galore Creek [Member]        
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates, Total   $ 100,000