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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Segment | Jun. 30, 2012 | Dec. 31, 2012
Segment Information [Abstract] |  |  |  |  |
Number of Reportable Segments |  |  | 2 |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total revenues | $ 7,915 | $ 8,522 | $ 15,794 | $ 16,857 |
Total operating expenses | 6,478 | 7,753 | 19,210 | 14,906 |
Total interest expense | 72 | 34 | 172 | 70 |
Operating income (loss) from identified segments | 118 | (991) | (6,042) | (1,703) |
General and administrative expenses | (1,319) | (1,760) | (2,626) | (3,654) |
Add back Interest expenses | 72 | 34 | 172 | 70 |
Other revenues and expenses: | 249 | 1,615 | 279 | 1,494 |
Income (loss) before income taxes and discontinued operations | 367 | 624 | (5,763) | (209) |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation expense | 3,282 | 4,182 | 6,814 | 7,980 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 135,616 |  | 135,616 |  | 140,827
Oil and Gas [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total revenues | 7,915 | 8,522 | 15,794 | 16,857 |
Total operating expenses | 5,778 | 7,111 | 17,866 | 13,645 |
Total interest expense | 72 | 28 | 148 | 58 |
Operating income (loss) from identified segments | 2,065 | 1,383 | (2,220) | 3,154 |
Add back Interest expenses | 72 | 28 | 148 | 58 |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation expense | 3,213 | 4,030 | 6,674 | 7,671 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 90,400 |  | 90,400 |  | 93,839
Mineral properties [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total operating expenses | 700 | 642 | 1,344 | 1,261 |
Total interest expense | 0 | 6 | 24 | 12 |
Operating income (loss) from identified segments | (700) | (648) | (1,368) | (1,273) |
Add back Interest expenses | 0 | 6 | 24 | 12 |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation expense | 32 | 32 | 64 | 64 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 20,746 |  | 20,746 |  | 20,747
Corporate [Member] |  |  |  |  |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation expense | 37 | 120 | 76 | 245 |
Assets by segment [Abstract] |  |  |  |  |
Total Assets | 24,313 |  | 24,313 |  | 26,241
Reportable Segment [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Operating income (loss) from identified segments | $ 1,365 | $ 735 | $ (3,588) | $ 1,881 |

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