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Note 33 - Related Parties (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Statement Line Items [Line Items] |  |
Estimated financial effect of contingent liabilities, determinate number of years for severance pay | 2 |
Expense from cash-settled share-based payment transactions including costs included in production costs | $ 43 | $ 311
Contingent liability arising from termination [member] |  |
Statement Line Items [Line Items] |  |
Estimated financial effect of contingent liabilities | $ 5,221 | $ 5,015

X
- Definition The number of years used to determine the severance pay. + References No definition available. + Details
Name: | cmcl_EstimatedFinancialEffectOfContingentLiabilitiesDeterminateNumberOfYearsForSeverancePay
Namespace Prefix: | cmcl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of expense arising from cash-settled share-based payment transactions in which the goods or services received did not qualify for recognition as assets including costs included in production costs. + References No definition available. + Details
Name: | cmcl_ExpenseFromCashsettledSharebasedPaymentTransactionsIncludingCostsIncludedInProductionCosts
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 the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 86 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_86_a&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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