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Concentrations of Credit Risk (Tables)
 12 Months Ended
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
%