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Concentrations of Credit Risk
 12 Months Ended
Jun. 30, 2014
Risks and Uncertainties [Abstract]  
Concentrations of Credit Risk
Concentrations of Credit Risk
Major Customers.    We market all of our oil and natural gas production from the properties we operate. The majority of our operated gas, oil and condensate production is sold to a variety of purchasers under short-term (less than 12 months) contracts at market-based prices. The following table identifies customers from whom we derived 10 percent or more our net oil and natural gas revenues during the years ended June 30, 2014, 2013, and 2012. 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
%

Accounts Receivable.    Substantially all of our accounts receivable result from uncollateralized oil and natural gas sales to third parties in the oil and natural gas industry. This concentration of customers may impact our overall credit risk in that these entities may be similarly affected by changes in economic and other conditions.
Cash and Cash Equivalents and Certificates of Deposit.    We are subject to concentrations of credit risk with respect to our cash and cash equivalents, which we attempt to minimize by maintaining our cash and cash equivalents in high quality money market funds. At times, cash balances may exceed limits federally insured by the Federal Deposit Insurance Corporation ("FDIC"). Our certificates of deposit are below or at the maximum federally insured limit set by the FDIC.