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Note 4 - Notes Receivable (Details Textual)
Jul. 27, 2018
USD ($)
May 31, 2023
USD ($)
Note Receivable Upon Completion of Galore Creek Project Pre-feasibility [Member]    
Statement [Line Items]    
Financing Receivable, after Allowance for Credit Loss $ 75,000 $ 75,000
Proceeds from Collection of Notes Receivable 75,000  
Note Receivable Upon Completion of Galore Creek Project Feasibility [Member]    
Statement [Line Items]    
Financing Receivable, after Allowance for Credit Loss 25,000 25,000
Notes Receivable, Fair Value Disclosure   24,855
Financing Receivable, Accumulated Accretion   $ 3,907
Note Receivable Upon Completion of Galore Creek Project Feasibility [Member] | Measurement Input, Expected Term [Member]    
Statement [Line Items]    
Notes Receivable, Measurement Input   5
Note Receivable Upon Completion of Galore Creek Project Feasibility [Member] | Measurement Input, Discount Rate [Member]    
Statement [Line Items]    
Notes Receivable, Measurement Input   0.036
Note Receivable Upon Approval of Galore Creek Project Construction Plan [Member]    
Statement [Line Items]    
Financing Receivable, after Allowance for Credit Loss 75,000  
Notes Receivable, Fair Value Disclosure 0  
Galore Creek [Member]    
Statement [Line Items]    
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates $ 100,000