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Revenue Recognition - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Total | $ 1,561 | $ 1,555 | [1]
Oil [Member] |  |  |
Total | 1,415 | 1,230 | [1]
Natural Gas and Liquids [Member] |  |  |
Total | 146 | 325 | [1]
North Dakota [Member] |  |  |
Total | 573 | 883 |
North Dakota [Member] | Oil [Member] |  |  |
Total | 522 | 795 |
North Dakota [Member] | Natural Gas and Liquids [Member] |  |  |
Total | 51 | 88 |
Texas [Member] |  |  |
Total | 988 | 512 |
Texas [Member] | Oil [Member] |  |  |
Total | 893 | 435 |
Texas [Member] | Natural Gas and Liquids [Member] |  |  |
Total | 95 | 77 |
Louisiana [Member] |  |  |
Total |  | 160 |
Louisiana [Member] | Oil [Member] |  |  |
Total |  |  |
Louisiana [Member] | Natural Gas and Liquids [Member] |  |  |
Total |  | $ 160 |
[1] | The condensed consolidated statement of operations for the three months ended March 31, 2018 was restated to include the loss on marketable equity securities in non-operating income rather than other comprehensive income as originally reported.

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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 + Details
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