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Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) (Tables)
 12 Months Ended
Jun. 30, 2013
Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited)  
Schedule of costs incurred and capitalized in oil and natural gas property acquisition, exploration and development activities
  For the Years Ended June 30  
 
   2013   2012   2011  

Oil and Natural Gas Activities

                    

Property acquisition costs:

                    

Proved property

   $ 26,449   $ 115,637   $ 465,176  

Unproved property

     195,599 *   5,544,217     523,591  

Exploration costs

     4,356,640     3,016,924     215,660  

Development costs

     79,035     238,463     2,200,905  
               

Total costs incurred for oil and natural gas activities

   $ 4,657,723   $ 8,915,241   $ 3,405,332  
               
*
Excludes $1,209,197 cost reduction due to reducing the Mississippian Lime joint venture interest in initial undrilled leasehold from 45% to 33.9%. See Note 5—Joint Interest Agreement.
Schedule of estimated quantities of proved oil and natural gas reserves and changes in quantities of proved developed and undeveloped reserves

  Crude Oil
(Bbls)		   Natural Gas
Liquids
(Bbls)		   Natural Gas
(Mcf)		   BOE  

Proved developed and undeveloped reserves:

                          

June 30, 2010

     10,254,470     1,036,627     6,762,954     12,418,256  

Revisions of previous estimates

     1,475,918     (84,154 )   3,273,846     1,937,405  

Improved recovery, extensions and discoveries

     —     —     779,556     129,926  

Sales of minerals in place

     (104,577 )   (221,469 )   (1,173,850 )   (521,688 )

Production (sales volumes)

     (57,965 )   (18,704 )   (238,607 )   (116,437 )
                   

June 30, 2011

     11,567,846     712,300     9,403,899     13,847,462  

Revisions of previous estimates

     84,219     (212,677 )   (1,295,893 )   (344,440 )

Improved recovery, extensions and discoveries

     137,634     5,461     18,925     146,249  

Sales of minerals in place

     —     —     —     —  

Production (sales volumes)

     (151,081 )   (12,611 )   (266,775 )   (208,155 )
                   

June 30, 2012

     11,638,618     492,473     7,860,156     13,441,116  

Revisions of previous estimates

     1,826,053     975,515     27,679     2,806,181  

Improved recovery, extensions and discoveries

     —     —     —     —  

Sales of minerals in place

     (485,536 )   (480,832 )   (7,726,032 )   (2,254,038 )

Production (sales volumes)

     (196,380 )   (7,271 )   (139,006 )   (226,819 )
                   

June 30, 2013

     12,782,755     979,885     22,797     13,766,440  
                   

Proved developed reserves:

                          

June 30, 2010

     706,053     157,302     1,536,858     1,119,498  

June 30, 2011

     4,986,337     100,900     1,543,401     5,344,471  

June 30, 2012

     7,670,934     111,978     1,499,382     8,032,809  

June 30, 2013

     10,077,522     8,539     22,797     10,089,861  
Schedule of standardized measure of discounted future net cash flows related to proved oil and natural gas reserves

  For the Years Ended June 30  
 
   2013   2012   2011  

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  
               
Schedule of NYMEX prices used in determining future cash flows
 
   Year Ended June 30,  
 
   2013   2012   2011  
 
   Oil
(Bbl)		   Gas
(MMBtu)		   Oil
(Bbl)		   Gas
(MMBtu)		   Oil
(Bbl)		   Gas
(MMBtu)		  

NYMEX prices used in determining future cash flows

   $ 91.51   $ 3.44   $ 95.67   $ 3.15   $ 90.09   $ 4.21  
Schedule of changes in the standardized measure of discounted future net cash flows applicable to proved crude oil, natural gas liquids, and natural gas reserves

  For the Years Ended June 30  
 
   2013   2012   2011  

Balance, beginning of year

   $ 283,597,493   $ 228,447,954   $ 161,626,649  

Net changes in sales prices and production costs related to future production

     (35,184,725 )   76,942,613     57,178,860  

Changes in estimated future development costs

     (566,125 )   6,340,123     (16,028,728 )

Sales of oil and gas produced during the period, net of production costs

     (19,569,182 )   (16,187,039 )   (6,151,549 )

Net change due to extensions, discoveries, and improved recovery

     —     1,606,122     623,446  

Net change due to revisions in quantity estimates

     64,817,544     (11,975,496 )   56,766,220  

Net change due to sales of minerals in place

     (34,119,027 )   —     (8,233,734 )

Development costs incurred during the period

     747,656     (2,639,398 )   2,416,565  

Accretion of discount

     41,678,733     22,568,868     26,597,834  

Net change in discounted income taxes

     10,175,957     (15,026,628 )   (42,490,270 )

Other

     (4,357,625 )   (6,479,626 )   (3,857,339 )
               

Balance, end of year

   $ 307,220,699   $ 283,597,493   $ 228,447,954