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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.

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