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Concentrations of Credit Risk (Tables)
 12 Months Ended
Jun. 30, 2017
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, 2017, 2016, and 2015. The loss of our purchasers 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.
 
Year Ended June 30,
Customers
2017
 
2016
 
2015
Plains Marketing L.P. (Oil sales from Delhi)
97
%
 
99
%
 
99
%
American Midstream Gas Solutions (NGL sales from Delhi)
3
%
 
—
%
 
—
%
All others
—
%
 
1
%
 
1
%
Total
100
%
 
100
%
 
100
%