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Note 15 - Leases - Financial Statement Amounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Statement Line Items [Line Items] |  |  |
Finance cost on lease liabilities | $ 24 | $ 15 | $ 17
Unrealised foreign exchange gain | 1 | (2) | 4
Depreciation | 115 | 99 | 112
Lease expense | 140 | 112 | 133
Total cash outflow for leases - principal | 129 | 118 | 124
Total cash outflow for leases - finance cost | $ (24) | $ (15) | $ (17)

X
- Definition Adjustments for unrealised foreign exchange losses (gains) related to leases to reconcile profit (loss) to net cash flow from (used in) operating activities. + References No definition available. + Details
Name: | cmcl_AdjustmentsForUnrealisedForeignExchangeLossesGainsRelatedToLeases
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow for interest paid related to lease liabilities. + References No definition available. + Details
Name: | cmcl_InterestPaidRelatedToLeaseLiabilities
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of recognized lease expense. + References No definition available. + Details
Name: | cmcl_LeaseExpense
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_a&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_b&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_InterestExpenseOnLeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_17_e&doctype=Standard -URIDate 2021-03-24 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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