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Supplemental Disclosure of Cash Flow Information (Tables)
 12 Months Ended
Jun. 30, 2013
Supplemental Disclosure of Cash Flow Information  
Schedule of supplemental disclosures of cash flow information
 
   Year Ended June 30,  
 
   2013   2012   2011  

Income taxes paid

   $ 699,874   $ 895,000   $ 229,802  

Income tax refunds and net operating loss carry-back received

   $ —   $ —   $ 979,177  

Non-cash transactions:

                    

Change in accounts payable used to acquire oil and natural gas leasehold interests and develop oil and natural gas properties

   $ 157,675   $ (196,396 ) $ (91,483 )

Change in due to joint venture partner used to acquire oil and natural gas leasehold interests and develop oil and natural gas properties

   $ (1,692,997 ) $ 1,958,029   $ —  

Oil and natural gas property costs attributable to the recognition of asset retirement obligations

   $ 65,575   $ 93,522   $ 15,000