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Retirement Obligation Asset (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Retirement obligation asset — beginning of period $ 203,274 $ 282,745
Additional obligations incurred 0 0
Amortization of retirement obligation asset (16,939) (79,471)
Retirement obligation asset — end of period $ 186,335 $ 203,274