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Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) (Details 3) (USD $)
 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Standardized measure of discounted future net cash flows      
Future cash inflows $ 1,436,980,607 $ 1,355,686,188 $ 1,161,278,060
Future production costs and severance taxes (510,902,614) (458,716,938) (379,493,392)
Future development costs (60,742,406) (38,458,724) (40,571,895)
Future income tax expenses (275,113,560) (296,703,838) (278,455,798)
Future net cash flows 590,222,027 561,806,688 462,756,975
10% annual discount for estimated timing of cash flows (283,001,328) (278,209,195) (234,309,020)
Standardized measure of discounted future net cash flows $ 307,220,699 $ 283,597,493 $ 228,447,955
Period considered for determining unweighted arithmetic average of first-day-of-the-month commodity prices 12 months    
Oil
      
Unweighted arithmetic average first-day-of-the-month commodity prices      
NYMEX prices used in determining future cash flows 91.51 95.67 90.09
Gas
      
Unweighted arithmetic average first-day-of-the-month commodity prices      
NYMEX prices used in determining future cash flows 3.44 3.15 4.21