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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.