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Significant Concentrations (Tables) | 6 Months Ended
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Jun. 30, 2019
Segment Reporting [Abstract] |
Schedule of Concentration Risk by Operator | During the six-month periods ended June 30, 2019 and 2018, the joint interest operators that accounted for 10% or more of the Company’s total oil and natural gas revenue for at least one of the periods presented are as follows:
Operator |  | 2019 |  |  | 2018 |
A |  |  | 52 | % |  |  | 17 | %
B |  |  | 29 | % |  |  | 47 | %
C |  |  | 9 | % |  |  | 14 | %
D |  |  | - | % |  |  | 10 | %

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