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Note 27 - Share-based Expenses (Tables)
 12 Months Ended
Dec. 31, 2019
Statement Line Items [Line Items]  
Explanation of effect of share-based payments on entity's profit or loss [text block]
    Note   2019     2018     2017  
                       
Restricted Share Units and Performance Units  
27.1.(a)
    
616
      
218
      
853
  
Caledonia Mining South Africa employee incentive scheme  
27.1.(b)
    
73
      
97
      
123
  
   
 
    
689
      
315
      
976
  
    Note   2019     2018     2017  
Share option programmes  
27.2 (a)
    
-
      
14
      
29
  
Facilitation and advanced dividend loan modification  
27.2 (b)
    
-
      
-
      
806
  
   
 
    
-
      
14
      
835
  
Disclosure of indirect measurement of fair value of goods or services received, share options granted during period [text block]
    2019   2018  
    RSUs     PSUs   RSUs     PSUs  
Fair value ($)   $
8.46
    
 
$8.19
 
   $
5.46
     $
5.46
  
Share price ($)   $
8.46
    
 
$8.46
 
   $
5.46
     $
5.46
  
Performance multiplier percentage    
-
    
93
-
100%
    
-
      
85
 %
    RSUs     PSUs     RSUs     PSUs  
Grant - January 11, 2016    
60,645
      
242,579
      
60,645
      
242,579
  
Grant - March 23, 2016    
10,965
      
43,871
      
10,965
      
43,871
  
Grant - June 8, 2016    
5,117
      
20,470
      
5,117
      
20,470
  
Grant - January 19, 2017    
4,443
      
17,774
      
4,443
      
17,774
  
Grant – January 19, 2019    
-
      
124,027
      
-
      
-
  
Grant – June 8, 2019    
-
      
14,672
      
-
      
-
  
RSU dividend reinvestments    
11,316
      
-
      
10,960
      
-
  
Settlements    
(87,434
 )    
(306,920
 )    
 
      
 
  
Total awards at December 31    
5,052
      
156,473
      
92,130
      
324,694
  
Options granted  
10,000
  
* 5,000
  
*18,000
Grant date  
February 27, 2018
  
May 30, 2018
  
October 13, 2017
Risk-free interest rate  
2,86%
  
2.40%
  
0.53%
Expected stock price volatility (based on historical volatility)  
32%
  
118%
  
119%
Expected option life in years  
3
  
3
  
5
Exercise price  
CAD 9.30
  
* CAD 8.10
  
* CAD 11.50
Share price at grant date  
CAD 9.30
  
* CAD 8.10
  
* CAD 11.50
Fair value at grant date  
$1.40
  
* $ 5.81
  
*$9.45
Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period [text block]
    2019     2018  
    Awards  
Grant - July 2017 (3-year term)    
37,330
      
37,330
  
Grant - August 2018 (3-year term)    
5,918
      
5,918
  
Grant - August 2019 (3-year term)    
9,034
      
-
  
Awards paid out    
(44,985
 )    
(26,864
 )
Total awards outstanding December 31    
7,297
      
16,384
  
                 
Estimated awards expected to vest at December 31    
100
 %    
100
 %
Disclosure of range of exercise prices of outstanding share options [text block]
Number of Options     Exercise Price     Expiry Date
      Canadian $      
  5,000      
4.00
    
Oct 8, 2020
  18,000      
11.50
    
Oct 13, 2021
  5,000      
8.10
    
May 30, 2022
  10,000      
9.30
    
Aug 25, 2024
  38,000              
Disclosure of number and weighted average exercise prices of share options [text block]
   
Number of Options
*
     Weighted Avg. Exercise Price  
    Canadian $
*
  
             
Options outstanding and exercisable at January, 2017    
92,280
      
5.85
  
Granted    
5,000
      
8.10
  
Exercised    
(69,280
 )    
4.50
  
Options outstanding and exercisable at December 31, 2017    
28,000
      
9.55
  
Granted    
10,000
      
9.30
  
Exercised    
-
      
-
  
Options outstanding and exercisable at December 31, 2018    
38,000
      
9.48
  
Granted    
-
      
-
  
Exercised    
-
      
-
  
Options outstanding and exercisable at December 31, 2019    
38,000
      
9.48
  
Faciliation and advanced dividend loans [member]  
Statement Line Items [Line Items]  
Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period [text block]
Modification date   June 23, 2017
Blanket Mine dividend yield  
23.70%
-
89.88%
Risk free interest rate  
$ swap curve
Group market capitalisation at grant date ($’000)  
$68,436