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Revenue Recognition - Schedule of Disaggregated Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Total revenue $ 1,211 $ 923
Oil [Member]    
Total revenue 1,132 855
Natural Gas and Liquids [Member]    
Total revenue 79 68
North Dakota [Member]    
Total revenue 601 538
North Dakota [Member] | Oil [Member]    
Total revenue 522 489
North Dakota [Member] | Natural Gas and Liquids [Member]    
Total revenue 79 49
Texas [Member]    
Total revenue 636 385
Texas [Member] | Oil [Member]    
Total revenue 618 366
Texas [Member] | Natural Gas and Liquids [Member]    
Total revenue 18 19
Other [Member]    
Total revenue [1] (26)
Other [Member] | Oil [Member]    
Total revenue [1] (8)
Other [Member] | Natural Gas and Liquids [Member]    
Total revenue [1] $ (18)
[1] Adjustments of estimated accruals to actual revenues received from non-operated properties in other regions.