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Note 19 - Share Capital (Details Textual) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 26, 2017 $ / shares shares | Jun. 26, 2017 USD ($) shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016
Statement Line Items [Line Items] |  |  |  |
Share consolidation ratio |  | 5 | 5 | 5
Cancelled treasury shares |  |  | 7,800 |
Share consolidation, initial consolidation of shares |  | 100 |  |
Share consolidation, threshold for shareholders to have shares repurchased |  | 100 |  |
Share consolidation price per pre-consolidation share | $ / shares | $ 1.664 |  |  |
Share consolidation, division of consolidated shares |  | 20 |  |
Shares repurchased during the period |  | 118,063 |  |
Purchase of treasury shares | $ |  | $ 146 | $ 146 |
Reduction in number of shares issued |  | 42,135,492 |  |
Preference shares [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Par value per share | $ / shares |  |  | $ 0 |
Total number of shares issued | 0 | 0 |  |
Ordinary shares [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Par value per share | $ / shares |  |  | $ 0 |

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- Definition Treasury shares cancelled during the period. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The number of shares issued reduced by the entity during the period. + References No definition available. + Details
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- Definition Number of shares for every one share that will be consolidated after the initial consolidation of shares. + References No definition available. + Details
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Namespace Prefix: | cmcl_
Data Type: | xbrli:pureItemType
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- Definition Number of shares for every one share that were consolidated. + References No definition available. + Details
Name: | cmcl_ShareConsolidationInitialConsolidationOfShares
Namespace Prefix: | cmcl_
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- Definition Amount per pre-consoldiation share that the fractional shares will be repurchased. + References No definition available. + Details
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Period Type: | duration

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- Definition Number of shares consolidated per one share during the period. + References No definition available. + Details
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- Definition Shareholders with fewer than the threshold that will have fractional shares repurchased. + References No definition available. + Details
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Period Type: | duration

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- Definition Number of shares repurchased during the period. + References No definition available. + Details
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Namespace Prefix: | cmcl_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Period Type: | duration

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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | na
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- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease in equity resulting from the purchase of treasury shares. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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- Details
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Balance Type: |
Period Type: |