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Note 16 - Tax Expense - Unrecognised Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Caledonia Holdings Zimbabwe (Private) Limited [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets $ 1,800 $ 1,800 $ 593
Greenstone Management Services Holdings Limited [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets 691 516 376
Unused tax losses [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets $ 2,491 $ 2,316 $ 969