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Commitments, Contingencies, and Related Party Transactions (Details Narrative) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2017 USD ($) | Sep. 30, 2013 a | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Rental income |  |  | $ 100 | $ 100 | $ 100
Professional fees |  |  | 2,314 | 1,994 | 1,866
Rental and other income/(loss) |  |  | 321 | $ 169 | $ (431)
Texas Quiet Title Action - Willerson Lease [Member] | Chesapeake Exploration, LLC [Member] |  |  |  |  |
Percentage of lease acquired |  | 15.00% |  |  |
Area of lease acquired | a |  | 4,244 |  |  |
Legal fees |  |  | 75 |  |
Professional fees |  |  | 165 |  |
Proceeds from the settlement | $ 175 |  |  |  |
Rental and other income/(loss) | $ 15 |  |  |  |
Texas Quiet Title Action - Willerson Lease [Member] | Former Employee [Member] | Executive Severance and Non-Compete Agreement [Member] |  |  |  |  |
Damages sought value |  |  | 1,800 |  |
Chief Executive Officer [Member] |  |  |  |  |
Payments of related party |  |  | $ 50 |  |

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