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Note 10 - Other Income - Government Grant (Details) | 1 Months Ended | 4 Months Ended | 13 Months Ended | 20 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2018 | Jun. 26, 2020 | Mar. 09, 2020 | Feb. 20, 2019 | Dec. 31, 2017
Statement Line Items [Line Items] |  |  |  |  |
Percentage | 2.50% | 25.00% | 0.00% | 10.00% | 3.50%

X
- Definition The percentage applied for export credit incentive (“ECI”) on applicable periods. + References No definition available. + Details
Name: | cmcl_PercentagesAppliedForEciApplicablePeriods
Namespace Prefix: | cmcl_
Data Type: | num:percentItemType
Balance Type: | na
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