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Consolidated Statements of Changes In Shareholders' Equity - USD ($)
$ in Thousands
Common Shares [Member]
Additional Paid-in Capital
Accumulated (Deficit)/ Retained Earnings
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
Balance at Dec. 31, 2016   $ 112,034 $ 2,040 $ (5,884) $ (1,171) $ 107,076
Balance (in shares) at Dec. 31, 2016 56,903,272          
Balance at Dec. 31, 2016 $ 57          
Adjustment to retained earnings as a result of adoption of ASU 2016-16     (533)     (533)
Stock-based compensation   1,192       1,192
Stock options exercised   58       58
Stock options exercised (in shares) 25,000          
Common stock issued for vested restricted stock units (in shares) 78,400          
Common stock issued for the acquisition of mineral properties   1,300       1,300
Common stock issued for the acquisition of mineral properties 246,210          
Dividends declared     (1,137)     (1,137)
Net income     4,150     4,150
Balance at Dec. 31, 2017 $ 57         57
Balance at Dec. 31, 2017   114,584 4,520 (5,884) (1,171) 112,106
Balance (in shares) at Dec. 31, 2017 57,252,882          
Stock-based compensation   485       485
Stock options exercised $ 1 1,066       1,067
Stock options exercised (in shares) 660,604          
Common stock issued for vested restricted stock units (in shares) 14,964          
Dividends declared     (574)     (574)
Net income     9,211     9,211
Balance at Jun. 30, 2018 $ 58         58
Balance at Jun. 30, 2018   $ 116,135 $ 13,157 $ (5,884) $ (1,171) $ 122,295
Balance (in shares) at Jun. 30, 2018 57,928,450