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Note 21 - Earnings Per Share - Earnings Per Share Computations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Issued shares at beginning of year (in shares) 52,787,428 52,078,908 52,117,908
Share consolidation (note 19) (in shares) (42,135,492) (41,663,126) (41,694,326)
Issued shares post consolidation (in shares) 10,651,936 10,415,782 10,423,582
Weighted average shares repurchased (in shares) (60,978)
Weighted average cancellation during the year (in shares) (4,565)
Weighted average shares issued (in shares) 16,924 41,460
Weighted average number of shares at December 31 (in shares) 10,607,882 10,457,242 10,419,017
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 - $ (in dollars per share) $ 0.86 $ 0.79 $ 0.45
Weighted average shares at December 31 (in shares) 10,607,882 10,457,242 10,419,017
Effect of dilutive options (in shares) 9,622 23,449 21,634
Weighted average number of shares (diluted) at December 31 (in shares) 10,617,504 10,480,691 10,440,651
Diluted earnings - per share ($) (in dollars per share) $ 0.86 $ 0.79 $ 0.45