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Concentrations of Credit Risk (Tables) | 12 Months Ended
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Jun. 30, 2016
Risks and Uncertainties [Abstract] |
Schedule of customers from whom the entity derived 10 percent or more of net oil and natural gas revenues |
| Year Ended June 30,
Customer | 2016 |  | 2015 |  | 2014
Plains Marketing L.P. (includes Delhi production) | 99 | % |  | 99 | % |  | 96 | %
Enterprise Crude Oil LLC | — | % |  | — | % |  | 2 | %
Flint Hills | — | % |  | — | % |  | 1 | %
ETC Texas Pipeline, LTD. | — | % |  | — | % |  | 1 | %
All others | 1 | % |  | 1 | % |  | — | %
Total | 100 | % |  | 100 | % |  | 100 | %

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