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Segment Information (Segment Activity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues-oil and natural gas sales | $ 18,178 | $ 14,635 |  |  | $ 59,869 | $ 44,458 |
Depreciation, depletion and amortization | 1,700 | 1,607 |  |  | 5,539 | 5,787 |
Impairment of proved properties |  | 88 | $ 0 | $ 0 |  | 88 |
Bad debt provision | (49) | 63 |  |  | 232 | 577 |
Other operating expense |  | 324 |  |  |  | 9,959 |
Operating income (loss) | 3,721 | 3,690 |  |  | 17,456 | (5,210) |
Interest income (expense), net | (327) | (327) |  |  | (1,108) | (2,285) |
Income tax expense | 2,749 | 2,198 |  |  | 9,039 | 6,884 |
Additions to properties and equipment - accrual | 297 | 681 |  |  | 1,111 | (1,672) |
Total assets | 76,535 |  |  |  | 76,535 |  | $ 81,032
Continuing Operations [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total assets | 73,762 |  |  |  | 73,762 |  | 78,893
Operating Segments [Member] | Gabon Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues-oil and natural gas sales | 18,162 | 14,540 |  |  | 59,823 | 44,212 |
Depreciation, depletion and amortization | 1,633 | 1,508 |  |  | 5,344 | 5,484 |
Bad debt provision | (49) | 63 |  |  | 232 | 577 |
Other operating expense |  | 324 |  |  |  | 9,959 |
Operating income (loss) | 6,067 | 5,013 |  |  | 25,117 | 1,481 |
Interest income (expense), net | (327) | (329) |  |  | (1,108) | (2,285) |
Income tax expense | 2,749 | 2,305 |  |  | 9,039 | 6,884 |
Additions to properties and equipment - accrual | 237 | 674 |  |  | 1,051 | (1,819) |
Operating Segments [Member] | Equatorial Guinea Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Operating income (loss) | (44) | (184) |  |  | (97) | (319) |
Operating Segments [Member] | U. S. Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues-oil and natural gas sales | 16 | 95 |  |  | 46 | 246 |
Depreciation, depletion and amortization |  | 38 |  |  | 1 | 121 |
Impairment of proved properties |  | 88 |  |  |  | 88 |
Operating income (loss) | 10 | (61) |  |  | 356 | (64) |
Additions to properties and equipment - accrual |  |  |  |  |  | 140 |
Operating Segments [Member] | Continuing Operations [Member] | Gabon Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total assets | 61,694 |  |  |  | 61,694 |  | 64,478
Operating Segments [Member] | Continuing Operations [Member] | Equatorial Guinea Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total assets | 10,093 |  |  |  | 10,093 |  | 10,122
Operating Segments [Member] | Continuing Operations [Member] | U. S. Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total assets | 83 |  |  |  | 83 |  | 382
Corporate And Other [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Depreciation, depletion and amortization | 67 | 61 |  |  | 194 | 182 |
Operating income (loss) | (2,312) | (1,078) |  |  | (7,920) | (6,308) |
Interest income (expense), net |  | 2 |  |  |  |  |
Income tax expense |  | (107) |  |  |  |  |
Additions to properties and equipment - accrual | 60 | $ 7 |  |  | 60 | $ 7 |
Corporate And Other [Member] | Continuing Operations [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Total assets | $ 1,892 |  |  |  | $ 1,892 |  | $ 3,911

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