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Note 34 - Group Entities (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of interests in subsidiaries [text block]
    Functional currency   Country of incorporation   Legal
shareholding		     Intercompany balances with Holding company  
            2018     2017     2018     2017  
Subsidiaries of the Company           %     %              
Caledonia Holdings Zimbabwe (Private) Limited  
$
  
Zimbabwe
    
100
      
100
      
—  
      
—  
  
Caledonia Mining Services Limited  
$
  
Zimbabwe
    
100
      
100
      
—  
      
—  
  
Eersteling Gold Mining Company Limited  
ZAR
  
South Africa
    
100
      
100
      
(13,179
 )    
(12,956
 )
Fintona Investments Proprietary Limited  
ZAR
  
South Africa
    
100
      
100
      
(14,859
 )    
(14,859
 )
Caledonia Mining South Africa Proprietary Limited  
ZAR
  
South Africa
    
100
      
100
      
(565
 )    
(941
 )
Greenstone Management Services Holdings Limited  
$
  
United Kingdom
    
100
      
100
      
9,813
      
20,879
  
Blanket Mine (1983) (Private) Limited
(3)
  
$
  
Zimbabwe
    
(2)
49		      
(2)
49		      
—  
      
—  
  
Blanket Employee Trust Services (Private) Limited (BETS)
(1)
  
$
  
Zimbabwe
    
—  
      
—  
      
—  
      
—