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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Schedule of Recurring Measurements of the Fair Value of Assets and Liabilities | Recurring measurements of the fair value of assets and liabilities as of December 31, 2017 and 2016 are as follows:
|  | December 31, 2017 |  |  | December 31, 2016 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Marketable equity securitites: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sutter Gold Mining Company |  | $ | - |  |  | $ | 8 |  |  | $ | - |  |  | $ | 8 |  |  | $ | - |  |  | $ | 16 |  |  | $ | - |  |  | $ | 16 |
Anfield Resources, Inc. |  |  | 868 |  |  |  | - |  |  |  | - |  |  |  | 868 |  |  |  | 930 |  |  |  | - |  |  |  | - |  |  |  | 930 |
Total |  | $ | 868 |  |  | $ | 8 |  |  | $ | - |  |  | $ | 876 |  |  | $ | 930 |  |  | $ | 16 |  |  | $ | - |  |  | $ | 946 |
Outstanding warrant liability |  |  | - |  |  |  | - |  |  |  | 1,200 |  |  |  | 1,200 |  |  |  | - |  |  |  | - |  |  |  | 1,030 |  |  |  | 1,030 |
Crude oil price risk derivatives |  |  | - |  |  |  | 161 |  |  |  | - |  |  |  | 161 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Total |  | $ | - |  |  | $ | 161 |  |  | $ | 1,200 |  |  | $ | 1,361 |  |  | $ | - |  |  | $ | - |  |  | $ | 1,030 |  |  | $ | 1,030 |
Schedule of Reconciliation of Changes in Assets and Liabilities Measured at Fair Value On a Recurring Basis | The following table presents a reconciliation of changes in assets and liabilities measured at fair value on a recurring basis for the years ended December 31, 2017 and 2016:
|  | Assets |  |  | Liabilities |
|  | Marketable Securities |  |  | Crude Oil |  |  | Crude Oil |  |  | Executive |  |  |  |  |  |  |
|  | Sutter |  |  | Anfield |  |  | Derivatives |  |  | Derivatives |  |  | Retirement |  |  | Warrants |  |  |  |
|  | (Level 2) |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 2) |  |  | (Level 3) |  |  | (Level 3) |  |  | Net |
Fair value, December 31, 2015 |  |  | 13 |  |  |  | 238 |  |  |  | 1,634 |  |  |  | - |  |  |  | (583 | ) |  |  | - |  |  |  | 1,302 |
Acquisition of investment |  |  | - |  |  |  | 750 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 750 |
Issuance of warrants |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1,240 |  |  |  | 1,240 |
Other comprehensive loss |  |  | 3 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 3 |
Fair value adjustments included in net loss: |  |  | - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized gain on warrant valuation |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (210 | ) |  |  | (210 | )
Net unrealized loss on Anfield Shares |  |  | - |  |  |  | (58 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (58 | )
Offset of derivative assets and liabilities |  |  | - |  |  |  | - |  |  |  | (194 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (194 | )
Cash settlements paid |  |  | - |  |  |  | - |  |  |  | (1,440 | ) |  |  | - |  |  |  | 583 |  |  |  | - |  |  |  | (857 | )
Fair value, December 31, 2016 |  | $ | 16 |  |  | $ | 930 |  |  | $ | - |  |  |  | - |  |  | $ | - |  |  | $ | 1,030 |  |  | $ | 1,976 |
Total net losses included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of investment |  |  | - |  |  |  | 777 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 777 |
Other comprehensive loss |  |  | (8 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (8 | )
Fair value adjustments included in net loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized loss on oil price risk derivatives |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (26 | ) |  |  | - |  |  |  | - |  |  |  | (26 | )
Net unrealized loss on warrant valuation |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 170 |  |  |  | 170 |
Net unrealized loss on Anfield Shares |  |  | - |  |  |  | (839 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (839 | )
Cash settlements paid |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (135 | ) |  |  | - |  |  |  | - |  |  |  | (135 | )
|  |  |  |  |  |  |  |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value, December 31, 2017 |  | $ | 8 |  |  | $ | 868 |  |  | $ | - |  |  |  | (161 | ) |  | $ | - |  |  | $ | 1,200 |  |  | $ | 1,915 |

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- Definition Tabular disclosure of the amount of gains or losses for the period included in earnings or resulted in a change to net assets, have arisen from the use of significant unobservable inputs (level 3) to measure the fair value of assets, liabilities, and financial instruments classified in shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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