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Note 16 - Tax Expense - Unrecognised Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Bilboes Holdings (Private) Limited [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets [1] $ 4,447 $ 0 $ 0
Caledonia Holdings Zimbabwe (Private) Limited [member] | Mining [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets 2,942 0 0
Caledonia Holdings Zimbabwe (Private) Limited [member] | Services [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets 1,805 1,805 1,205
Blanket Employee Trust Services (Private) Limited (BETS) [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets 260 227 130
Caledonia Mining Services Limited [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets 0 69 5
Greenstone Management Services Holdings Limited [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets [2] 144 176 139
Unused tax losses [member]      
Statement Line Items [Line Items]      
Unrecognised deferred tax assets $ 9,598 $ 2,277 $ 1,479
[1] Assessed losses of Bilboes of $3,763 was acquired during 2023.
[2] Assessed losses of Greenstone Management Services (Pty) Ltd (UK) are not carried over and reset to zero each year.