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FAIR VALUE MEASUREMENTS (Details) - Recurring Measurements [Member] - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total $ 25
Level 1 [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] | 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] | Equity Securities [Member] | Sutter Gold Mining Company [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites $ 25
Level 1 [Member] | Equity Securities [Member] | Anfield Resources, Inc. [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total $ 1,647
Level 2 [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] | 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] | Equity Securities [Member] | Sutter Gold Mining Company [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites $ 13
Level 2 [Member] | Equity Securities [Member] | Anfield Resources, Inc. [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total $ 238
Level 3 [Member] | Executive Retirement Program Liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Executive retirement liability $ 584 $ 1,309
Level 3 [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] | Equity Securities [Member] | Sutter Gold Mining Company [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites
Level 3 [Member] | Equity Securities [Member] | Anfield Resources, Inc. [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites $ 238
Total [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total 1,885 $ 25
Total [Member] | Executive Retirement Program Liability [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Executive retirement liability 584 $ 1,309
Total [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
Total [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 13 $ 25
Total [Member] | Equity Securities [Member] | Anfield Resources, Inc. [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable equity securitites $ 238