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Note 9 - Other Income (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of other operating income components [text block]
    2017     2016     2015  
Government grant – Gold sale export incentive    
2,446
      
1,104
      
-
  
Other    
148
      
226
      
110
  
Total    
2,594
      
1,330
      
110