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Note 16 - Tax Expense - Unrecognised Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Eersteling Gold Mining Company Limited [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets $ 4,989
Caledonia Holdings Zimbabwe (Private) Limited [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets 593 421
Greenstone Management Services Holdings Limited [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets 376 276 191
Unused tax losses [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets $ 969 $ 697 $ 5,180