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Note 21 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Earnings per share [text block]
(In number of shares)   Note   2017     2016     2015  
                       
Issued shares at beginning of year  
19
    
52,787,428
      
52,078,908
      
52,117,908
  
Share consolidation (note 19)  
 
    
(42,135,492
 )    
(41,663,126
 )    
(41,694,326
 )
Issued shares post consolidation  
 
    
10,651,936
      
10,415,782
      
10,423,582
  
Weighted average shares repurchased  
 
    
(60,978
 )    
-
      
-
  
Weighted average cancellation during the year  
 
    
-
      
-
      
(4,565
 )
Weighted average shares issued  
 
    
16,924
      
41,460
      
-
  
Weighted average number of shares at December 31  
 
    
10,607,882
      
10,457,242
      
10,419,017
  
    2017     2016     2015  
Profit attributable to shareholders    
9,384
      
8,526
      
4,779
  
Blanket Mine Employee Trust Adjustment    
(210
 )    
(238
 )    
(100
 )
Adjusted profit attributable to shareholders    
9,174
      
8,288
      
4,679
  
Basic earnings per share - $    
0.86
      
0.79
      
0.45
  
Weighted average number of shares
(In number of shares)
   2017     2016     2015  
Weighted average shares at December 31    
10,607,882
      
10,457,242
      
10,419,017
  
Effect of dilutive options    
9,622
      
23,449
      
21,634
  
Weighted average number of  shares (diluted) at December 31    
10,617,504
      
10,480,691
      
10,440,651
  
Diluted earnings per share - $    
0.86
      
0.79
      
0.45