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Note 31 - Group Entities - Subsidiaries of the Company (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
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 $ (12,956) $ (12,793)
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 $ (941) $ (87)
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 $ 20,879 $ 13,527
Caledonia Holdings (Africa) Limited [member]    
Statement Line Items [Line Items]    
Percentage of ownership 100.00% 100.00%
Caledonia Holdings (Africa) Limited [member] | Elimination of intersegment amounts [member]    
Statement Line Items [Line Items]    
Net assets
Blanket (Barbados) Holdings Limited [member]    
Statement Line Items [Line Items]    
Percentage of ownership 100.00% 100.00%
Blanket (Barbados) Holdings Limited [member] | Elimination of intersegment amounts [member]    
Statement Line Items [Line Items]    
Net assets
Blanket Mine (1983) (Private) Limited [member]    
Statement Line Items [Line Items]    
Percentage of ownership [1],[2] 49.00% 49.00%
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 5, 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.