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Concentrations of Credit Risk (Tables)
 12 Months Ended
Jun. 30, 2014
Risks and Uncertainties [Abstract]  
Schedule of customers from whom the entity derived 10 percent or more of net oil and natural gas revenues
Based on the current demand for oil and natural gas and availability of other customers, we do not believe the loss of any of these customers would have a significant effect on our operations or financial condition.
 
Year Ended June 30,
Customer
2014
 
2013
 
2012
Plains Marketing L.P. (includes Delhi production)
96
%
 
90
%
 
84
%
Enterprise Crude Oil LLC
2
%
 
4
%
 
7
%
Flint Hills
1
%
 
2
%
 
1
%
ETC Texas Pipeline, LTD. 
1
%
 
—
%
 
3
%
All others
—
%
 
4
%
 
5
%
Total
100
%
 
100
%
 
100
%