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Note 13 - Leases (Details Textual) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($)
Statement Line Items [Line Items] |
Number of leases | 2
Total lease liabilities | $ 349
Bottom of range [member] |
Statement Line Items [Line Items] |
Leases, term | 3 years
Top of range [member] |
Statement Line Items [Line Items] |
Leases, term | 6 years

X
- Definition The term of leases. + References No definition available. + Details
Name: | cmcl_LeasesTerm
Namespace Prefix: | cmcl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of leases held. + References No definition available. + Details
Name: | cmcl_NumberOfLeases
Namespace Prefix: | cmcl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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 liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |