Annual report pursuant to Section 13 and 15(d)

Asset Retirement Obligation (Details)

v3.8.0.1
Asset Retirement Obligation (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning asset retirement obligation $ 11,882,943 $ 12,839,042
Liabilities assumed 0 0
ARO accretion expense 663,065 726,664
Revision in cash flow estimates (3,375,515) (1,682,763)
Ending asset retirement obligation $ 9,170,493 $ 11,882,943