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Organization, Operations and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Schedule of Concentration of Credit Risk | During the years ended December 31, 2018 and 2017, the joint interest operators that accounted for 10% or more of the Company’s total oil and natural gas revenue for at least one of the periods presented accounted for the following percentages of the Company’s total oil and natural gas revenue:
Operator |  | 2018 |  |  | 2017 |
A |  |  | 14 | % |  |  | 13 | %
B |  |  | - | % |  |  | 25 | %
C |  |  | 47 | % |  |  | 34 | %
D |  |  | 18 | % |  |  | 5 | %
Schedule of Property and Equipment Useful Life | Land, buildings, improvements, machinery and equipment are carried at cost. Depreciation of buildings, improvements, machinery and equipment is provided principally by the straight-line method over estimated useful lives as follows:
|  | Years |
Real estate: |  |  |  |
Buildings |  |  | 20 to 45 |
Building improvements |  |  | 10 to 25 |
Land improvements |  |  | 10 to 35 |
Administrative assets: |  |  |  |
Computers and software |  |  | 3 to 10 |
Office furniture and equipment |  |  | 5 to 20 |
Vehicles and other |  |  | 5 |

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