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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
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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.

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