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Note 9 - Other Income (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Statement Line Items [Line Items] |  |
Government grants, export incentive on gold | 3.50% | 2.50%

X
- Definition Export incentive on gold proceeds received from government grants. + References No definition available. + Details
Name: | cmcl_GovernmentGrantsExportIncentiveOnGold
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