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Asset Retirement Obligations - Schedule of Asset Retirement Obligations (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]    
Balance, beginning of year $ 939,000 $ 913,000
Accretion 12,000 25,000
Sold/Plugged (18,000)
New drilled wells 2,000 19,000
Change in discount rate (15,000)
Liabilities incurred
Balance, end of year $ 938,000 $ 939,000