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Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Segment | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total interest expense | $ 56 | $ 130 | $ 145 | $ 214 |
Operating income (loss) from identified segments | (5,927) | 769 | (29,446) | 1,396 |
General and administrative expenses | (1,221) | (1,533) | (2,700) | (3,139) |
Add back Interest expenses | 56 | 130 | 145 | 214 |
Other revenues and expenses | (353) | (713) | (537) | (1,090) |
Income (loss) before income taxes | (6,280) | 56 | (29,983) | 306 |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation depletion amortization expense | 2,122 | 3,651 | 5,063 | 7,013 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 95,418 |  | 95,418 |  | $ 123,523
Reportable Segment [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total revenues | 3,285 | 9,128 | 5,964 | 17,384 |
Total operating expenses | 7,991 | 6,826 | 32,710 | 12,849 |
Total interest expense | 56 | 130 | 145 | 214 |
Operating income (loss) from identified segments | (4,762) | 2,172 | (26,891) | 4,321 |
Add back Interest expenses | 56 | 130 | 145 | 214 |
Reportable Segment [Member] | Oil and gas [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total revenues | 3,285 | 9,128 | 5,964 | 17,384 |
Total operating expenses | 7,284 | 6,169 | 31,250 | 11,435 |
Total interest expense | 56 | 130 | 145 | 214 |
Operating income (loss) from identified segments | (4,055) | 2,829 | (25,431) | 5,735 |
Add back Interest expenses | 56 | 130 | 145 | 214 |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation depletion amortization expense | 2,055 | 3,583 | 4,929 | 6,877 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 66,291 |  | 66,291 |  | 92,020
Reportable Segment [Member] | Mineral properties [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total operating expenses | 707 | 657 | 1,460 | 1,414 |
Total interest expense | 0 | 0 | 0 | 0 |
Operating income (loss) from identified segments | (707) | (657) | (1,460) | (1,414) |
Add back Interest expenses | 0 | 0 | 0 | 0 |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation depletion amortization expense | 31 | 30 | 62 | 61 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 21,944 |  | 21,944 |  | 21,942
Corporate, Non-Segment [Member] |  |  |  |  |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation depletion amortization expense | 36 | $ 38 | 72 | $ 75 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | $ 7,183 |  | $ 7,183 |  | $ 9,561

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