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Fair Value Measurements (Tables)

12 Months Ended

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

X

- 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

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- References

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X

- 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

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