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Note 14 - Provision for Site Reclamation and Closure (Details Textual) - Provision for decommissioning, restoration and rehabilitation costs [member]
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Undiscounted cash flow obligation, measurement input [member]      
Statement Line Items [Line Items]      
Significant unobservable input, liabilities 7,013,000 6,246,000 6,065,000
Expected timing of future cash flows, measurement input [member] | Bottom of range [member]      
Statement Line Items [Line Items]      
Significant unobservable input, liabilities 2,026    
Expected timing of future cash flows, measurement input [member] | Top of range [member]      
Statement Line Items [Line Items]      
Significant unobservable input, liabilities 2,041    
Annual inflation rate, measurement input [member]      
Statement Line Items [Line Items]      
Significant unobservable input, liabilities   0.0225 0.025
Annual inflation rate, measurement input [member] | Bottom of range [member]      
Statement Line Items [Line Items]      
Significant unobservable input, liabilities 0.0229 0.0225  
Annual inflation rate, measurement input [member] | Top of range [member]      
Statement Line Items [Line Items]      
Significant unobservable input, liabilities 0.0283 0.0261  
Risk-free interest rate, measurement input [member]      
Statement Line Items [Line Items]      
Significant unobservable input, liabilities   0.0302 0.0328
Risk-free interest rate, measurement input [member] | Bottom of range [member]      
Statement Line Items [Line Items]      
Significant unobservable input, liabilities 0.0323    
Risk-free interest rate, measurement input [member] | Top of range [member]      
Statement Line Items [Line Items]      
Significant unobservable input, liabilities 0.0333