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Note 5 - Critical Accounting Estimates and Judgments - Schedule of Key Assumptions for Reclamation Obligations (Details) - Provision for decommissioning, restoration and rehabilitation costs [member]
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Risk-free interest rate, measurement input [member]      
Statement Line Items [Line Items]      
Key assumptions   0.0302 0.0328
Risk-free interest rate, measurement input [member] | Bottom of range [member]      
Statement Line Items [Line Items]      
Key assumptions 0.0323    
Risk-free interest rate, measurement input [member] | Top of range [member]      
Statement Line Items [Line Items]      
Key assumptions 0.0333    
Annual inflation rate, measurement input [member]      
Statement Line Items [Line Items]      
Key assumptions   0.0225 0.025
Annual inflation rate, measurement input [member] | Bottom of range [member]      
Statement Line Items [Line Items]      
Key assumptions 0.0229 0.0225  
Annual inflation rate, measurement input [member] | Top of range [member]      
Statement Line Items [Line Items]      
Key assumptions 0.0283 0.0261