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Note 4 - Notes Receivable (Details Textual)
$ in Thousands
Jul. 27, 2021
USD ($)
Jul. 27, 2018
USD ($)
Feb. 28, 2022
USD ($)
yr
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     23,782
Financing Receivable, Accumulated Accretion     $ 2,834
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