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Note 14 - Derivative Financial Instruments - Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Statement Line Items [Line Items] |  |  |
Cash flows arising from investing activities | $ 478 | $ (0) | $ (0)
Cash flows arising from financing activities | (3,458) | 4,026 | (1,058)
Gold loan agreement [member] |  |  |
Statement Line Items [Line Items] |  |  |
Cash flows arising from financing activities | (3,698) | 2,752 | 0
Call option [member] |  |  |
Statement Line Items [Line Items] |  |  |
Cash flows arising from financing activities, proceeds | 0 | 208 | 0
Call options acquisitions [member] |  |  |
Statement Line Items [Line Items] |  |  |
Cash flows arising from financing activities, proceeds | (176) | 0 | 0
Cap and collar options and call options [member] |  |  |
Statement Line Items [Line Items] |  |  |
Cash flows arising from financing activities, proceeds | 416 | 0 | 0
Gold ETF [member] |  |  |
Statement Line Items [Line Items] |  |  |
Cash flows arising from financing activities | 0 | $ 1,066 | $ (1,058)
Put option [member] |  |  |
Statement Line Items [Line Items] |  |  |
Cash flows arising from investing activities | $ 478 |  |

X
- Definition The cash inflow from futures contracts, forward contracts, option contracts and swap contracts except when the contracts are held for dealing or trading purposes or the receipts are classified as financing activities. + References No definition available. + Details
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Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow (outflow) for futures contracts, forward contracts, option contracts and swap contracts except when the contracts are held for dealing or trading purposes or the payments are classified as financing activities. + References No definition available. + Details
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Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | cmcl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow for futures contracts, forward contracts, option contracts and swap contracts except when the contracts are held for dealing or trading purposes or the payments are classified as financing activities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 16 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_16_g&doctype=Standard -URIDate 2021-03-24 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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