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FAIR VALUE MEASUREMENTS (Details) - Recurring Measurements [Member] - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total |  | $ 1,178 |
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 |  | 31 |
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 | [1] | 1,147 |
Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total |  | 174 | 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 |  | 174 | 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 | [1] |  |
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
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 | [1] |  | 238
Total [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total |  | 1,352 | 1,885
Total [Member] | Executive Retirement Program Liability [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Executive retirement liability |  |  | 584
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 |  | 174 | 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 |  | 31 | 13
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 | [1] | $ 1,147 | $ 238
[1] | For the period from September 1, 2015 when the Company acquired its investment in Anfield Resources, Inc. ("Anfield") through March 31, 2016, average daily trading volume was approximately 10,000 shares and management concluded that the quoted marked price was not an accurate indicator of fair value. Accordingly, alternative methods were used to determine fair value upon receipt of the shares in September 2015, which required classification under Level 3 of the fair value hierarchy. During the second quarter of 2016, average daily trading volume increased to more than 240,000 shares and management now classifies its investment in Anfield under Level 1 of the fair value hierarchy. As a result of the reclassification of Anfield to Level 1, the Company recognized an unrealized gain of $909 during the three and six months ended June 30, 2016.

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