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Note 26 - Share-based Expenses - Other Equity Share Units Granted (Details) - Cash-settled awards [member] | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2018 | Jul. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Statement Line Items [Line Items] |  |  |  |
Grants | 5,918 | 37,330 |  |
Awards paid out |  |  | (26,864) |
Total awards outstanding December 31 |  |  | 16,384 | 37,330
Estimated awards expected to vest at December 31 |  |  | 100.00% | 100.00%
July 2017 [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Grants |  |  | 37,330 | 37,330
August 2018 [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Grants |  |  | 5,918 |

X
- Definition The estimated percentage of awards that are expected to vest. + References No definition available. + Details
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Namespace Prefix: | cmcl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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X
- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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- Details
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