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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 |

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