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Note 5 - Blanket Zimbabwe Indigenisation Transaction (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of indigenisation shareholder percentages and facilitation loan balances [text block]
                      Balance of facilitation loan #  
USD 000's   Shareholding     NCI Recognised     NCI subject to facilitation  loan     Dec, 31, 2017     Dec, 31 2016  
NIEEF    
16
 %    
3.2
 %    
12.8
 %    
11,879
      
11,990
  
Fremiro    
15
 %    
3.0
 %    
12.0
 %    
11,504
      
11,682
  
Community Trust    
10
 %    
10.0
 %    
-
      
-
      
-
  
BETS    
10
 %    
-
 *    
-
 *    
7,669
      
7,788
  
     
51
 %    
16.2
 %    
24.8
 %    
31,052
      
31,460
  
Disclosure of facilitation loans [text block]
Balance at January 1, 2016    
31,336
  
Interest accrued    
1,359
  
Dividends used to repay loans    
(1,235
 )
Balance at December 31, 2016    
31,460
  
Interest accrued    
1,136
  
Dividends used to repay loans    
(1,544
 )
Balance at December 31, 2017    
31,052
  
Disclosure of movement in dividend loan [text block]
    Total  
       
Balance at January 1, 2016    
3,237
  
Interest accrued    
133
  
Dividends used to repay advance dividends    
(370
 )
Balance at December 31, 2016    
3,000
  
Interest accrued    
104
  
Dividends used to repay advance dividends    
(500
 )
Balance at December 31, 2017    
2,604