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Note 35 - Group Entities - Subsidiaries of the Company (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 05, 2018
Dec. 31, 2019
Dec. 31, 2018
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  
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   $ 1,750 $ (565)
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   $ 14,902 $ 9,813
Blanket Mine (1983) (Private) Limited [member]      
Statement Line Items [Line Items]      
Percentage of ownership 64.00% 49.00% [1] 49.00% [1]
Blanket Mine (1983) (Private) Limited [member] | Elimination of intersegment amounts [member]      
Statement Line Items [Line Items]      
Net assets   $ (400)
Blanket Employee Trust Services (Private) Limited (BETS) [member]      
Statement Line Items [Line Items]      
Percentage of ownership [2]  
Blanket Employee Trust Services (Private) Limited (BETS) [member] | Elimination of intersegment amounts [member]      
Statement Line Items [Line Items]      
Net assets [2]  
[1] Refer to Note 6, for the effective shareholding. NCI has a 16.2% interest in cash flows of Blanket only.
[2] BETS and the Employee Trust are consolidated as structured entities.