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Note 5 - Blanket Zimbabwe Indigenization Transaction (Tables)
 6 Months Ended
Jun. 30, 2020
Statement Line Items [Line Items]  
Disclosure of indigenisation shareholder percentages and facilitation loan balances [text block]
                              Balance of facilitation loan #  
USD     Shareholding       NCI Recognised       NCI subject to facilitation loan      
June 30,
2020
      
Dec 31,
2019
  
NIEEF    
16
 %    
3.2
 %    
12.8
 %    
11,849
      
11,877
  
Fremiro     -
&
       -
&
       -
&
      
-
&
      
11,458
  
Community Trust    
10
 %    
10.0
 %    
-
      
-
      
-
  
BETS ~    
10
 %    
-
 *    
-
 *    
7,573
      
7,639
  
     
36
 %    
13.2
 %    
12.8
 %    
19,422
      
30,974
  
Disclosure of movement in dividend loan [text block]
      2020       2019  
                 
Balance at January 1,    
30,974
      
30,986
  
Cancellation of Fremiro loan    
(11,458
 )    
-
  
Dividends used to repay loans    
(793
 )    
(540
 )
Interest accrued    
699
      
536
  
Balance at June 30,    
19,422
      
30,982
  
Disclosure of facilitation loans [text block]
      2020       2019  
                 
Balance at January 1,    
1,632
      
2,053
  
Dividends used to repay advance dividends    
(336
 )    
(175
 )
Interest accrued    
53
      
37
  
Balance at June 30,    
1,349
      
1,915