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Note 17 - Tax Expense - Unrecognised Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Caledonia Holdings Zimbabwe (Private) Limited [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets $ 1,800 $ 593 $ 421
Greenstone Management Services Holdings Limited [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets 516 376 276
Unused tax losses [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets $ 2,316 $ 969 $ 697