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v3.20.1

Dispositions (Narrative) (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2019 USD ($) | Apr. 30, 2017 USD ($) | Nov. 30, 2006 | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 item
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of crude oil and natural gas properties |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000 |
Liability for the potential payment | $ 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  | $ (37,000) | $ (61,000) | $ (162,000) | $ 5,671,000 | $ (80,000) | $ (21,000) | $ (343,000) | $ (52,000) | $ 5,411,000 | $ (496,000) | (621,000) |
Joint Operating With Republic Of Angola [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint operation agreement related to third party in working interest percentage |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |
Additional joint operation agreement related to third party in working interest percentage |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Number of wells drilled | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Number of drilled wells required by agreement | item |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
Stipulated payment for each exploration well, under PSA terms |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000.0 |  |  |
Drilling commitment, net |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |  | 5,000,000.0 |  |  |
Liability for the potential payment |  |  |  |  |  |  |  | $ 15,000,000.0 |  |  |  |  | 15,000,000.0 |  |
East Poplar Dome Field [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of crude oil and natural gas properties |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale of property |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |
Discontinued Operations [Member] | Joint Operating With Republic Of Angola [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for the potential payment |  |  |  |  |  |  | 4,500,000 |  |  |  |  |  |  |  |
Write off of receivable |  |  |  |  |  |  | 3,300,000 |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  | $ 5,700,000 |  |  |  |  | $ 5,411,000 | $ (496,000) | $ (621,000) |
Payment for settlement | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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