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7. Asset Retirement Obligation (Tables)
9 Months Ended
Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Asset retirement obligation
  Nine Months Ended 
   September 30, 
   2015   2014 
Beginning ARO  $286,804   $160,665 
Liabilities incurred for new wells placed in production   42,391    61,815 
Accretion of discount on ARO   23,900    15,486 
Ending ARO  $353,095   $237,966