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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 Segment | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | 2 |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total interest expense | $ 130 | $ 72 | $ 214 | $ 172 |
Operating income (loss) from identified segments | 769 | 151 | 1,396 | (5,974) |
General and administrative expenses | (1,533) | (1,286) | (3,139) | (2,558) |
Add back Interest expenses | 130 | 72 | 214 | 172 |
Other revenues and expenses | (713) | 216 | (1,090) | 211 |
Income (loss) before income taxes and discontinued operations | 56 | 367 | 306 | (5,763) |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation expense | 3,651 | 3,282 | 7,013 | 6,814 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 124,634 |  | 124,634 |  | 126,801
Corporate [Member] |  |  |  |  |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation expense | 38 | 37 | 75 | 76 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 7,299 |  | 7,299 |  | 8,644
Reportable Segment [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total revenues | 9,128 | 7,915 | 17,384 | 15,794 |
Total operating expenses | 6,826 | 6,478 | 12,849 | 19,210 |
Total interest expense | 130 | 72 | 214 | 172 |
Operating income (loss) from identified segments | 2,172 | 1,365 | 4,321 | (3,588) |
Add back Interest expenses | 130 | 72 | 214 | 172 |
Reportable Segment [Member] | Oil and Gas [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total revenues | 9,128 | 7,915 | 17,384 | 15,794 |
Total operating expenses | 6,169 | 5,778 | 11,435 | 17,866 |
Total interest expense | 130 | 72 | 214 | 148 |
Operating income (loss) from identified segments | 2,829 | 2,065 | 5,735 | (2,220) |
Add back Interest expenses | 130 | 72 | 214 | 148 |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation expense | 3,583 | 3,213 | 6,877 | 6,674 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 95,393 |  | 95,393 |  | 97,418
Reportable Segment [Member] | Mineral properties [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total operating expenses | 657 | 700 | 1,414 | 1,344 |
Total interest expense | 0 | 0 | 0 | 24 |
Operating income (loss) from identified segments | (657) | (700) | (1,414) | (1,368) |
Add back Interest expenses | 0 | 0 | 0 | 24 |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation expense | 30 | 32 | 61 | 64 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | $ 21,942 |  | $ 21,942 |  | $ 20,739

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