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Note 34 - Group Entities - Subsidiaries of the Company (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 05, 2018
Dec. 31, 2018
Dec. 31, 2017
Caledonia Holdings Zimbabwe (Private) Limited [member]      
Statement Line Items [Line Items]      
Percentage of ownership   100.00% 100.00%
Caledonia Holdings Zimbabwe (Private) Limited [member] | Elimination of intersegment amounts [member]      
Statement Line Items [Line Items]      
Net assets  
Caledonia Mining Services Limited [member]      
Statement Line Items [Line Items]      
Percentage of ownership   100.00% 100.00%
Caledonia Mining Services Limited [member] | Elimination of intersegment amounts [member]      
Statement Line Items [Line Items]      
Net assets  
Eersteling Gold Mining Company Limited [member]      
Statement Line Items [Line Items]      
Percentage of ownership   100.00% 100.00%
Eersteling Gold Mining Company Limited [member] | Elimination of intersegment amounts [member]      
Statement Line Items [Line Items]      
Net assets   $ (13,179) $ (12,956)
Fintona Investments Proprietary Limited [member]      
Statement Line Items [Line Items]      
Percentage of ownership   100.00% 100.00%
Fintona Investments Proprietary Limited [member] | Elimination of intersegment amounts [member]      
Statement Line Items [Line Items]      
Net assets   $ (14,859) $ (14,859)
Caledonia Mining South Africa Proprietary Limited [member]      
Statement Line Items [Line Items]      
Percentage of ownership   100.00% 100.00%
Caledonia Mining South Africa Proprietary Limited [member] | Elimination of intersegment amounts [member]      
Statement Line Items [Line Items]      
Net assets   $ (565) $ (941)
Greenstone Management Services Holdings Limited [member]      
Statement Line Items [Line Items]      
Percentage of ownership   100.00% 100.00%
Greenstone Management Services Holdings Limited [member] | Elimination of intersegment amounts [member]      
Statement Line Items [Line Items]      
Net assets   $ 9,813 $ 20,879
Blanket Mine (1983) (Private) Limited [member]      
Statement Line Items [Line Items]      
Percentage of ownership 64.00% 49.00% [1],[2] 49.00% [1],[2]
Blanket Mine (1983) (Private) Limited [member] | Elimination of intersegment amounts [member]      
Statement Line Items [Line Items]      
Net assets [1]  
Blanket Employee Trust Services (Private) Limited (BETS) [member]      
Statement Line Items [Line Items]      
Percentage of ownership [3]  
Blanket Employee Trust Services (Private) Limited (BETS) [member] | Elimination of intersegment amounts [member]      
Statement Line Items [Line Items]      
Net assets [3]  
[1] Blanket has no subsidiary companies
[2] Refer to Note 6, for the effective shareholding. NCI has a 16.2% interest in cash flows of Blanket only.
[3] BETS and the Employee Trust are consolidated as structured entities.