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FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Outstanding warrant liability $ 1,030
Recurring Measurements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Outstanding warrant liability 1,240  
Recurring Measurements [Member] | Total [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 946 1,885
Outstanding warrant liability 1,030
Total 1,030 584
Recurring Measurements [Member] | Total [Member] | Executive Retirement Program Liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Executive retirement liability 584
Recurring Measurements [Member] | Crude Oil Derivatives Assets [Member] | Total [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Crude oil price risk derivatives 1,634
Recurring Measurements [Member] | Equity Securities [Member] | Total [Member] | Sutter Gold Mining Company [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites [1] 16 13
Recurring Measurements [Member] | Equity Securities [Member] | Total [Member] | Anfield Resources, Inc. [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites [2] 930 238
Level 1 [Member] | Recurring Measurements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 930 25
Outstanding warrant liability
Total
Level 1 [Member] | Recurring Measurements [Member] | Executive Retirement Program Liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Executive retirement liability
Level 1 [Member] | Recurring Measurements [Member] | Crude Oil Derivatives Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Crude oil price risk derivatives
Level 1 [Member] | Recurring Measurements [Member] | Equity Securities [Member] | Sutter Gold Mining Company [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites [1]
Level 1 [Member] | Recurring Measurements [Member] | Equity Securities [Member] | Anfield Resources, Inc. [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites [2] 930
Level 2 [Member] | Recurring Measurements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 16 1,647
Outstanding warrant liability
Total
Level 2 [Member] | Recurring Measurements [Member] | Executive Retirement Program Liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Executive retirement liability
Level 2 [Member] | Recurring Measurements [Member] | Crude Oil Derivatives Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Crude oil price risk derivatives 1,634
Level 2 [Member] | Recurring Measurements [Member] | Equity Securities [Member] | Sutter Gold Mining Company [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites [1] 16 13
Level 2 [Member] | Recurring Measurements [Member] | Equity Securities [Member] | Anfield Resources, Inc. [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites [2]
Level 3 [Member] | Recurring Measurements [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 238
Outstanding warrant liability 1,030
Total 1,030 584
Level 3 [Member] | Recurring Measurements [Member] | Executive Retirement Program Liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Executive retirement liability 584
Level 3 [Member] | Recurring Measurements [Member] | Crude Oil Derivatives Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Crude oil price risk derivatives
Level 3 [Member] | Recurring Measurements [Member] | Equity Securities [Member] | Sutter Gold Mining Company [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites [1]
Level 3 [Member] | Recurring Measurements [Member] | Equity Securities [Member] | Anfield Resources, Inc. [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites [2] $ 238
[1] Due to a less active market for this investment, during the fourth quarter of 2015 the Company transferred this investment from Level 1 to Level 2 of the fair value hierarchy.
[2] Because the trading volume of Anfield shares have increased since we took possession, we determined a mark-to-market technique would be most appropriate to determine the fair value for Anfield shares. Previously, the Company used alternative methods to determine fair value upon receipt of the shares in September 2015, which requires classification under Level 3 of the fair value hierarchy. The Company has reclassified the Anfield shares under Level 1 of the fair value hierarchy.