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SIGNIFICANT ACCOUNTING POLICIES (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]      
Revenue from mining operations $ 34,116 $ 33,359 $ 34,692
Cost of sales 27,850 22,106 22,961
Mine operating income 6,266 11,253 11,731
Operating expenses and other items 300 464 925
Net income before income taxes 2,033 5,293 6,455
Income taxes (407) (2,771) (4,439)
Net income $ 1,626 $ 2,522 $ 2,016
Earnings per share      
Basic $ 0.03 $ 0.05 $ 0.05
Diluted $ 0.03 $ 0.05 $ 0.05
As Previously Reported [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Revenue from mining operations   $ 33,359 $ 30,105
Cost of sales   21,975 19,161
Mine operating income   11,384 10,944
Operating expenses and other items   5,960 5,276
Net income before income taxes   5,424 5,668
Income taxes   2,771 4,164
Net income   $ 2,653 $ 1,504
Earnings per share      
Basic   $ 0.05 $ 0.04
Diluted   $ 0.05 $ 0.03
Adjustment [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Revenue from mining operations   $ 4,587
Cost of sales   131 3,800
Mine operating income   (131) 787
Operating expenses and other items  
Net income before income taxes   (131) 787
Income taxes   275
Net income   $ (131) $ 512
Earnings per share      
Basic   $ 0.00 $ 0.01
Diluted   $ 0.00 $ 0.02
As Adjusted [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Revenue from mining operations   $ 33,359 $ 34,692
Cost of sales   22,106 22,961
Mine operating income   11,253 11,731
Operating expenses and other items   5,960 5,276
Net income before income taxes   5,293 6,455
Income taxes   2,771 4,439
Net income   $ 2,522 $ 2,016
Earnings per share      
Basic   $ 0.05 $ 0.05
Diluted   $ 0.05 $ 0.05