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FAIR VALUE MEASUREMENTS (Tables)
6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Schedule of recurring measurements of the fair value of assets and liabilities

Recurring measurements of the fair value of assets and liabilities as of June 30, 2017 and December 31, 2016 are as follows:

 

    June 30, 2017     December 31, 2016  
    Level 1     Level 2     Level 3     Total     Level 1     Level 2     Level 3     Total  
                                                 
Marketable equity securities:                                                                
Sutter Gold Mining Company   $ 11     $     $     $ 11     $ 16     $     $     $ 16  
Anfield Resources, Inc.     611                   611       930                   930  
Crude oil price risk derivatives             311             311                          
Total   $ 622     $ 311     $     $ 933     $ 946     $     $     $ 946  
                                                                 
Outstanding warrant liability   $     $     $ 510     $ 510     $     $     $ 1,030     $ 1,030  
Schedule of reconciliation of changes in assets and liabilities measured at fair value on a recurring basis

The following table presents a reconciliation of changes in assets and liabilities measured at fair value on a recurring basis for the period ended June 30, 2017 and the year ended December 31, 2016.

 

    Assets     Liabilities        
    Marketable Securities and Derivatives      
    Sutter     Anfield     Derivatives     Warrants          
    (Level 1)     (Level 1)     (Level 2)     (Level 3)     Net  
Fair value, December 31, 2016   $ 16     $ 930     $       1,030     $ 1,976  
                                         
Total net losses included in:                                        
Other comprehensive loss     (5 )     (319 )                 (324 )
Fair value adjustments included in net loss:                                        
Net unrealized gain on warrant fair value adjustment                       (520 )     (520 )
Crude oil price risk derivatives                 311             311  
Fair value, June 30, 2017   $ 11     $ 611       311       510     $ 1,443