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INVESTMENTS (Details)
$ in Thousands
12 Months Ended
Jul. 21, 2016
USD ($)
item
May 13, 2016
USD ($)
item
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Investments rollforward          
Opening balance     $ 1,032 $ 1,082  
Additions during the year     4,419 1,114  
Disposals during the period     (470)    
Other Comprehensive Income (Loss) (pre -tax)     3,043 (1,164)  
Statement of Operations (Loss) Income     519    
Fair Value end of the year     8,543 1,032 $ 1,082
Fair value Available for Sale          
Opening balance     1,032    
Additions during the period     4,419 1,114 446
Disposals during the period     (470)    
Fair Value end of the period     8,543 1,032  
Fair value of warrants          
Cost of purchase of marketable equity securities     4,900 1,900  
Unrealized gain on available-for-sale securities     1,600    
Unrealized loss on available-for-sale securities       900  
Sale of marketable securities     500    
Gain on available-for-sale securities     100    
Other-than-temporary impairment on marketable equity securities     882 0  
Golden Predator Mining Corporation          
Fair value of warrants          
Number of units acquired | item 1,500,000 3,125,000      
Common shares per unit | item 1 1      
Warrants per unit | item 0.50 1      
Payments For Purchase Of Private Placement $ 900 $ 400      
Common Stock | Golden Predator Mining Corporation          
Fair value of warrants          
Payments For Purchase Of Private Placement 700 $ 200      
Warrants | Golden Predator Mining Corporation          
Fair value of warrants          
Payments For Purchase Of Private Placement $ 200        
Marketable equity securities          
Fair value Available for Sale          
Opening balance     1,032 1,082  
Additions during the period     4,004 1,114  
Disposals during the period     (470)    
Other Comprehensive Income (Loss) (pre -tax)     3,043 (1,164)  
Statement of Operations (Loss) Income     (860)    
Fair Value end of the period     6,749 $ 1,032 $ 1,082
Warrants          
Fair value Available for Sale          
Additions during the period     415    
Fair value of warrants          
Statement of Operations (Loss) Income     1,379    
Fair Value end of the year     $ 1,794