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Revenue Recognition - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Total	$ 1,872	$ 1,573	[1]	$ 3,433	$ 3,128
Oil [Member]
Total	1,760	1,292	[1]	3,175	2,522
Natural Gas and Liquids [Member]
Total	112	281	[1]	258	606
North Dakota [Member]
Total	679	866		1,252	1,761
North Dakota [Member] | Oil [Member]
Total	637	784		1,159	1,589
North Dakota [Member] | Natural Gas and Liquids [Member]
Total	42	82		93	172
Texas [Member]
Total	1,193	562		2,181	1,062
Texas [Member] | Oil [Member]
Total	1,123	508		2,016	933
Texas [Member] | Natural Gas and Liquids [Member]
Total	70	54		165	129
Louisiana [Member]
Total		145			305
Louisiana [Member] | Oil [Member]
Total
Louisiana [Member] | Natural Gas and Liquids [Member]
Total		$ 145			$ 305
[1] The condensed consolidated statement of operations for the three months ended June 30, 2018 was restated to exclude the loss on marketable equity securities of $78 thousand related to the three months ended March 31, 2018.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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