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Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oil and gas sales |  | $ 12,687 |  | $ 1,538 |  | $ 1,992 |  | $ 1,747 |  | $ 817 |  | $ 1,867 |  | $ 1,996 |  | $ 1,066 |  | $ 6,545 | $ 5,746 | $ 10,296
Impairment of oil and gas properties |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,611) |  | (6,957) |  |  | 9,568 | 57,676
Other | [1] | (1,451) |  | (1,601) |  | (1,996) |  | (2,485) |  | 276 |  | (2,761) |  | (3,061) |  | (2,561) |  |  |  |
Operating income |  | (183) | [1] | (63) | [1] | (4) | [1] | (738) | [1] | 1,093 | [1] | (894) | [1] | (3,676) | [1] | (8,452) | [1] | (988) | (11,929) | (69,064)
Income (loss) from continuing operations |  | 98 | [1] | (382) | [1] | (336) | [1] | (740) | [1] | 1,074 | [1] | (265) | [1] | (4,206) | [1] | (8,275) | [1] | (1,360) | (11,672) | (67,284)
Discontinued operations |  |  |  |  |  |  |  |  |  | (111) |  |  |  | (10) |  | (2,327) |  |  | (2,448) | (25,612)
Net income (loss) |  | $ 983 |  | $ (382) |  | $ (336) |  | $ (740) |  | $ 963 |  | $ (265) |  | $ (4,216) |  | $ (10,602) |  | $ (1,360) | $ (14,120) | $ (92,896)
Income (loss) per share - basic, Continuing operations | [1],[2] | $ 0.02 |  | $ (0.06) |  | $ (0.02) |  | $ (0.13) |  | $ 0.23 |  | $ (0.06) |  | $ (0.90) |  | $ (1.76) |  |  |  |
Income (loss) per share - basic, Discontinued operations | [1],[2] |  |  |  |  |  |  |  |  |  |  |  |  | (0.00) |  | (0.49) |  |  |  |
Income (loss) per share - basic, Total | [1],[2] | 0.02 |  | (0.06) |  | (0.02) |  | (0.13) |  | 0.23 |  | (0.06) |  | (0.90) |  | (2.25) |  |  |  |
Income (loss) per share - diluted, Continuing operations | [1],[2] | 0.02 |  | (0.06) |  | (0.02) |  | (0.13) |  | 0.23 |  | (0.06) |  | (0.90) |  | (1.76) |  |  |  |
Income (loss) per share - diluted, Discontinued operations | [1],[2] |  |  |  |  |  |  |  |  |  |  |  |  | (0.00) |  | (0.49) |  |  |  |
Income (loss) per share - diluted, Total | [1],[2] | $ 0.02 |  | $ (0.06) |  | $ (0.02) |  | $ (0.13) |  | $ 0.23 |  | $ (0.06) |  | $ (0.90) |  | $ (2.25) |  |  |  |
Weighted average shares outstanding: Basic |  | 5,899,802 |  | 5,834,568 |  | 5,834,568 |  | 5,834,568 |  | 4,768,013 |  | 4,768,000 |  | 4,705,000 |  | 4,705,500 |  | 5,899,802 | 4,768,013 | 4,677,500
Weighted average shares outstanding: Diluted |  | 5,899,802 | [1] | 5,834,568 | [1] | 6,626,344 | [1] | 5,834,568 | [1] | 4,768,013 | [1] | 4,768,000 | [1] | 4,705,000 | [1] | 4,705,500 | [1] | 5,899,802 | 4,768,013 | 4,677,500
[1] | Amounts have been restated from amounts reported in previous reports to retroactively present the impact of Discontinued Operations as discussdiscussed further in Note 6.
[2] | Earnings per share amounts may not sum due to rounding.

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