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Note 10 - Other Income (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of other operating income components [text block]
    2018     2017     2016  
                   
Government grant – Gold sale export incentive    
6,482
      
2,446
      
1,104
  
Eersteling rock dump sale    
217
      
—  
      
—  
  
Greenstone Provident Fund pay-out    
363
      
—  
      
—  
  
Other    
39
      
148
      
226
  
     
7,101
      
2,594
      
1,330