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Concentrations of Credit Risk (Tables)

12 Months Ended

Jun. 30, 2018

Risks and Uncertainties [Abstract]

Schedule of customers from whom the entity derived 10 percent or more of net oil and natural gas revenues

The following table identifies customers from whom we derived 10 percent or more of our net oil and natural gas revenues during the years ended June 30, 2018, 2017, and 2016. The loss of our purchaser at the Delhi field or disruption to pipeline transportation from the field could adversely affect our net realized pricing and potentially our near-term production levels. The loss of any of our other purchasers would not be expected to have a material adverse effect on our operations.

	Year Ended June 30,
Customer	2018			2017			2016
Plains Marketing L.P. (Oil sales from Delhi)	92	%		97	%		99	%
American Midstream Gas Solutions (NGL sales from Delhi)	8	%		3	%		—	%
All others	—	%		—	%		1	%
Total	100	%		100	%		100	%

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- Definition

Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.

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