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Note 30 - Share-based Payments (Tables)
 12 Months Ended
Dec. 31, 2020
Statement Line Items [Line Items]  
Explanation of effect of share-based payments on entity's profit or loss [text block]
     
Note
       2020       2019       2018  
                                 
Restricted Share Units and Performance Units    
30.1
(a)
    
1,299
      
616
      
218
  
Caledonia Mining South Africa employee incentive scheme    
30.1
(b)
    
114
      
73
      
97
  
     
 
 
    
1,413
      
689
      
315
  
     
Note
       2020       2019       2018  
                                 
Share option programmes    
30.2
(a)
     –       –      
14
  
     
 
 
     –       –      
14
  
Disclosure of indirect measurement of fair value of goods or services received, share options granted during period [text block]
    December 31,   December 31,
    2020   2019
     
RSUs
      
PUs
      
RSUs
      
PUs
  
Fair value (USD)   $
15.88
     $
15.51
     $
8.46
     $
8.19
  
Share price (USD)   $
15.88
     $
15.88
     $
8.46
     $
8.46
  
Performance multiplier percentage    
–
      
93
-
100%
      
–
      
93
-
100%
  
                                 
Share units granted:                                
     
RSUs
     
PUs
     
RSUs
     
PUs
 
                                 
Grant – January 11, 2016    
–
      
–
      
60,645
      
242,579
  
Grant- March 23, 2016    
–
      
–
      
10,965
      
43,871
  
Grant – June 8, 2016    
–
      
–
      
5,117
      
20,470
  
Grant - January 19, 2017    
4,443
      
17,774
      
4,443
      
17,774
  
Grant - January 11, 2019    
–
      
95,740
      
–
      
95,740
  
Grant - March 23, 2019    
–
      
28,287
      
–
      
28,287
  
Grant - June 8, 2019    
–
      
14,672
      
–
      
14,672
  
Grant - January 11, 2020    
17,585
      
114,668
      
–
      
–
  
Grant - March 31, 2020    
–
      
1,971
      
–
      
–
  
Grant - June 1, 2020    
–
      
1,740
      
–
      
–
  
Grant - September 9, 2020    
–
      
1,611
      
–
      
–
  
Grant - September 14, 2020    
–
      
20,686
      
–
      
–
  
Grant - October 5, 2020    
–
      
514
      
–
      
–
  
RSU dividends reinvested    
995
      
–
      
11,316
      
–
  
Settlements/ terminations    
(5,052
 )    
(17,774
 )    
(87,434
 )    
(306,920
 )
Total awards    
17,971
      
279,889
      
5,052
      
156,473
  
Options Granted    
10,000
  
Grant date    
February 27, 2018
  
Risk-free interest rate    
2.86
 %
Expected stock price volatility (based on historical volatility)    
32
 %
Expected option life in years    
3
  
Exercise price    
CAD 9.30
  
Share price at grant date    
CAD 9.30
  
Fair value at grant date   $
1.40
  
Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period [text block]
      2020       2019  
     
Awards
  
Grant – July 2017 (3-year term)    
–
      
37,330
  
Grant – August 2018 (3-year term)    
5,918
      
5,918
  
Grant - August 2019 (3-year term)    
9,034
      
9,034
  
Awards paid out/ expired    
(11,941
 )    
(44,985
 )
Total awards outstanding    
3,011
      
7,297
  
                 
Estimated awards expected to vest    
100
 %    
100
 %
Disclosure of range of exercise prices of outstanding share options [text block]
 
Number of Options
      
Exercise Price
     Expiry Date
         
Canadian $
      
  18,000      
11.50
    
Oct 13, 2021
  10,000      
9.30
    
Aug 25, 2024
  28,000              
Disclosure of number and weighted average exercise prices of share options [text block]
     
Number of
Options
      
Weighted Avg.
Exercise Price
  
             
Canadian $
  
Options outstanding and excercisable at January 1, 2019    
38,000
      
9.48
  
Granted    
-
      
-
  
Exercised    
-
      
-
  
Options outstanding and excercisable at December 31, 2019    
38,000
      
9.48
  
Granted    
-
      
-
  
Exercised    
(5,000
 )    
8.10
  
Expired    
(5,000
 )    
4.00
  
Options outstanding and excercisable at December 31, 2020    
28,000
      
10.71