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FAIR VALUE MEASUREMENTS (Details 1) - Recurring Measurements [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value | $ (1,284) | $ (1,062)
Total net losses included in: |  |
Other comprehensive loss | (12) | (44)
Fair value adjustments included in net loss: |  |
Net realized losses (gains) on oil price risk derivatives | (75) | 316
Net unrealized gains on oil price risk derivatives | 1,634 | 266
Retirement expense | $ (45) | $ (585)
Offset of derivative assets and liabilities |  |
Transfer from Level 1 to Level 2 |  |
Acquisition of investment | $ 238 |
Discount negotiated on settlement | 77 |
Cash settlements paid (received) | 769 | $ (175)
Fair value | 1,302 | (1,284)
Level 1 [Member] | Sutter Gold Mining Company [Member] | Equity Securities [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value | 25 | 69
Total net losses included in: |  |
Other comprehensive loss | (12) | (44)
Fair value adjustments included in net loss: |  |
Transfer from Level 1 to Level 2 | $ (13) |
Fair value |  | 25
Level 2 [Member] | Crude Oil Derivatives Liability[Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value |  | (280)
Fair value adjustments included in net loss: |  |
Net realized losses (gains) on oil price risk derivatives | $ (40) |
Net unrealized gains on oil price risk derivatives |  | 266
Offset of derivative assets and liabilities | $ 40 | $ 14
Fair value |  |
Level 2 [Member] | Crude Oil Derivatives Assets [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value |  | $ 14
Fair value adjustments included in net loss: |  |
Net realized losses (gains) on oil price risk derivatives | $ (35) | 316
Net unrealized gains on oil price risk derivatives | 1,634 |
Offset of derivative assets and liabilities | (40) | (14)
Cash settlements paid (received) | 75 | $ (316)
Fair value | $ 1,634 |
Level 2 [Member] | Sutter Gold Mining Company [Member] | Equity Securities [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value |  |
Fair value adjustments included in net loss: |  |
Transfer from Level 1 to Level 2 | $ 13 |
Fair value | 13 |
Level 3 [Member] | Executive Retirement Program Liability [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value | (1,309) | $ (865)
Fair value adjustments included in net loss: |  |
Retirement expense | (45) | (585)
Discount negotiated on settlement | 77 |
Cash settlements paid (received) | 694 | 141
Fair value | $ (583) | $ (1,309)
Level 3 [Member] | Anfield Resources Inc. [Member] | Equity Securities [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value |  |
Fair value adjustments included in net loss: |  |
Net unrealized gains on oil price risk derivatives |  |
Acquisition of investment | $ 238 |
Fair value | $ 238 |

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- Definition The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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