Quarterly report pursuant to Section 13 or 15(d)

Reconciliation of Asset Retirement Obligations (ARO) (Detail)

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Reconciliation of Asset Retirement Obligations (ARO) (Detail) - USD ($)
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Asset Retirement Obligation Disclosure [Abstract]    
Beginning balance $ 749,013  
Liabilities incurred 0  
Accretion expense 55,187 $ 49,712
Revisions to estimate 0  
Ending balance 804,200  
Less current asset retirement obligations (297,700)  
Long-term asset retirement obligations $ 506,500