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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
ASSETS        
Total current assets $ 22,947 $ 26,591 $ 35,128  
Plant, equipment and mining properties 38,743 32,158 28,076  
Other long-term assets 10 34 27  
Total assets 108,588 102,835 94,131  
LIABILITIES        
Total liabilities 9,841 10,188 11,821  
EQUITY        
Accumulated deficit (16,505) (18,877) (21,538)  
Total equity 75,168 69,002 61,794 $ 37,353
Total liabilities and equity $ 108,588 102,835 94,131  
As Previously Reported [Member]        
ASSETS        
Total current assets   26,591 35,128  
Plant, equipment and mining properties   31,952 27,739  
Other long-term assets   44,086 30,927  
Total assets   102,629 93,794  
LIABILITIES        
Total liabilities   33,833 32,337  
EQUITY        
Accumulated deficit   (19,083) (21,875)  
Other equity   87,879 83,332  
Total equity   68,796 61,457  
Total liabilities and equity   102,629 93,794  
Adjustment [Member]        
ASSETS        
Total current assets    
Plant, equipment and mining properties   206 337  
Other long-term assets    
Total assets   206 337  
LIABILITIES        
Total liabilities    
EQUITY        
Accumulated deficit   206 337  
Other equity    
Total equity   206 337  
Total liabilities and equity   206 337  
As Adjusted [Member]        
ASSETS        
Total current assets   26,591 35,128  
Plant, equipment and mining properties   32,158 28,076  
Other long-term assets   44,086 30,927  
Total assets   102,835 94,131  
LIABILITIES        
Total liabilities   33,833 32,337  
EQUITY        
Accumulated deficit   (18,877) (21,538)  
Other equity   87,879 83,332  
Total equity   69,002 61,794  
Total liabilities and equity   $ 102,835 $ 94,131