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FAIR VALUE MEASUREMENTS (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Fair value adjustments included in net loss: |  |
Issuance of warrants | $ 1,030 |
Recurring Measurements [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value | 1,302 | (1,284)
Total net losses included in: |  |
Other comprehensive loss | 3 | (12)
Fair value adjustments included in net loss: |  |
Net realized losses on oil price risk derivatives |  | (75)
Net unrealized gains on oil price risk derivatives |  | 1,634
Net unrealized gain on warrant valuation | (210) |
Net unrealized loss on Anfield Shares | (58) |
Retirement expense |  | (45)
Transfer from Level 1 to Level 2 |  |
Issuance of warrants | 1,240 |
Acquisition of investment | 750 | 238
Discount negotiated on settlement |  | 77
Offset of derivative assets and liabilities | (194) |
Cash settlements paid (received) | (857) | 769
Fair value | 1,976 | 1,302
Level 1 [Member] | Recurring Measurements [Member] |  |
Fair value adjustments included in net loss: |  |
Issuance of warrants |  |
Level 1 [Member] | Recurring Measurements [Member] | Sutter Gold Mining Company [Member] | Equity Securities [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value |  | 25
Total net losses included in: |  |
Other comprehensive loss |  | (12)
Fair value adjustments included in net loss: |  |
Net realized losses on oil price risk derivatives |  |
Net unrealized gains on oil price risk derivatives |  |
Retirement expense |  |
Transfer from Level 1 to Level 2 |  | (13)
Acquisition of investment |  |
Discount negotiated on settlement |  |
Offset of derivative assets and liabilities |  |
Cash settlements paid (received) |  |
Fair value |  |
Level 1 [Member] | Recurring Measurements [Member] | Anfield Resources, Inc. [Member] | Equity Securities [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value |  |
Total net losses included in: |  |
Other comprehensive loss |  |
Fair value adjustments included in net loss: |  |
Net unrealized loss on Anfield Shares | (58) |
Acquisition of investment | 750 | 238
Level 2 [Member] | Recurring Measurements [Member] |  |
Fair value adjustments included in net loss: |  |
Issuance of warrants |  |
Level 2 [Member] | Recurring Measurements [Member] | Crude Oil Derivatives Liability[Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value |  |
Fair value adjustments included in net loss: |  |
Net realized losses on oil price risk derivatives |  | (40)
Net unrealized gains on oil price risk derivatives |  |
Retirement expense |  |
Transfer from Level 1 to Level 2 |  |
Discount negotiated on settlement |  |
Offset of derivative assets and liabilities |  | 40
Fair value |  |
Level 2 [Member] | Recurring Measurements [Member] | Crude Oil Derivatives Assets [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value | 1,634 |
Fair value adjustments included in net loss: |  |
Net realized losses on oil price risk derivatives | 0 | (35)
Net unrealized gains on oil price risk derivatives |  | 1,634
Offset of derivative assets and liabilities | (194) | (40)
Cash settlements paid (received) | (1,440) | 75
Fair value |  | 1,634
Level 2 [Member] | Recurring Measurements [Member] | Sutter Gold Mining Company [Member] | Equity Securities [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value | 13 |
Total net losses included in: |  |
Other comprehensive loss | 3 |
Fair value adjustments included in net loss: |  |
Transfer from Level 1 to Level 2 |  | 13
Fair value | 16 | 13
Level 3 [Member] | Recurring Measurements [Member] |  |
Fair value adjustments included in net loss: |  |
Issuance of warrants | 1,030 |
Level 3 [Member] | Recurring Measurements [Member] | Executive Retirement Program Liability [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value | (583) | (1,309)
Fair value adjustments included in net loss: |  |
Retirement expense |  | (45)
Discount negotiated on settlement |  | 77
Cash settlements paid (received) | 583 | 694
Fair value |  | (583)
Level 3 [Member] | Recurring Measurements [Member] | Warrant [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value |  |
Fair value adjustments included in net loss: |  |
Net unrealized gain on warrant valuation | (210) |
Issuance of warrants | 1,240 |
Fair value | 1,030 |
Level 3 [Member] | Recurring Measurements [Member] | Anfield Resources, Inc. [Member] | Equity Securities [Member] |  |
Fair Value, Net Asset (Liability) [RollForward] |  |
Fair value | 238 |
Fair value adjustments included in net loss: |  |
Fair value | $ 930 | $ 238

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