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Note 4 - Notes Receivable (Details Textual)
$ in Thousands
Jul. 27, 2018
USD ($)
yr
Aug. 31, 2020
USD ($)
Note Receivable Upon Completion of Galore Creek Project Pre-feasibility [Member]    
Financing Receivable, after Allowance for Credit Loss, Total $ 75,000  
Receivable Instrument, Term (Year) 3 years  
Note Receivable Upon Completion of Galore Creek Project Pre-feasibility [Member] | Measurement Input, Expected Term [Member]    
Notes Receivable, Measurement Input | yr 3  
Note Receivable Upon Completion of Galore Creek Project Feasibility [Member]    
Financing Receivable, after Allowance for Credit Loss, Total $ 25,000  
Receivable Instrument, Term (Year) 5 years  
Note Receivable Upon Completion of Galore Creek Project Feasibility [Member] | Measurement Input, Expected Term [Member]    
Notes Receivable, Measurement Input | yr 5  
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 $ 95,162
Financing Receivable, Accumulated Accretion   $ 6,764
Notes Receivable Upon Completion Of Galore Creek Project [Member]    
Notes Receivable, Fair Value Disclosure $ 88,398  
Notes Receivable Upon Completion Of Galore Creek Project [Member] | Measurement Input, Discount Rate [Member]    
Notes Receivable, Measurement Input 0.036