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Note 4 - Significant Accounting Policies (Details Textual)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement Line Items [Line Items]      
Revenue recognition, variable rate 1.25%    
Revenue recognition, average settlement period (Day) 14 days    
Royalty on gold sales 5.00%    
Bottom of range [member]      
Statement Line Items [Line Items]      
Right of use assets, useful life (Year) 3 years 3 years 3 years
Top of range [member]      
Statement Line Items [Line Items]      
Right of use assets, useful life (Year) 6 years 6 years 6 years
Buildings [member] | Bottom of range [member]      
Statement Line Items [Line Items]      
Useful life measured as period of time, property, plant and equipment (Year) 10 years 10 years 10 years
Buildings [member] | Top of range [member]      
Statement Line Items [Line Items]      
Useful life measured as period of time, property, plant and equipment (Year) 15 years 15 years 15 years
Machinery [member]      
Statement Line Items [Line Items]      
Useful life measured as period of time, property, plant and equipment (Year) 10 years 10 years 10 years
Fixtures and fittings [member] | Bottom of range [member]      
Statement Line Items [Line Items]      
Useful life measured as period of time, property, plant and equipment (Year) 4 years 4 years 4 years
Fixtures and fittings [member] | Top of range [member]      
Statement Line Items [Line Items]      
Useful life measured as period of time, property, plant and equipment (Year) 10 years 10 years 10 years
Motor vehicles [member]      
Statement Line Items [Line Items]      
Useful life measured as period of time, property, plant and equipment (Year) 4 years 4 years 4 years