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Retirement Obligation Asset (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Retirement obligation asset — beginning of period $ 282,745 $ 617,126
Additional obligations incurred 0 0
Amortization of retirement obligation asset (36,435) (334,381)
Retirement obligation asset — end of period $ 246,310 $ 282,745