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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 Segment | Mar. 31, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | 2 |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |
Total revenues | $ 8,256 | $ 7,879 |
Total operating expenses | 6,023 | 12,732 |
Total interest expense | 84 | 114 |
Operating income (loss) from identified segments | 627 | (6,125) |
General and administrative expenses | (1,606) | (1,272) |
Add back Interest expenses | 84 | 114 |
Other revenues and expenses | (377) | (5) |
Income (loss) before income taxes and discontinued operations | 250 | (6,130) |
Depreciation depletion and amortization expense [Abstract] |  |  |
Total depreciation expense | 3,362 | 3,798 |
Assets by segment [Abstract] |  |  |
Total Assets | 128,777 |  | 126,801
Oil and Gas [Member] |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |
Total revenues | 8,256 | 7,879 |
Total operating expenses | 5,266 | 12,088 |
Total interest expense | 84 | 111 |
Operating income (loss) from identified segments | 2,906 | (4,320) |
Add back Interest expenses | 84 | 111 |
Depreciation depletion and amortization expense [Abstract] |  |  |
Total depreciation expense | 3,294 | 3,641 |
Assets by segment [Abstract] |  |  |
Total Assets | 99,614 |  | 97,418
Mineral properties [Member] |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |
Total operating expenses | 757 | 644 |
Total interest expense | 0 | 3 |
Operating income (loss) from identified segments | (757) | (647) |
Add back Interest expenses | 0 | 3 |
Depreciation depletion and amortization expense [Abstract] |  |  |
Total depreciation expense | 31 | 32 |
Assets by segment [Abstract] |  |  |
Total Assets | 21,942 |  | 20,739
Corporate [Member] |  |  |
Depreciation depletion and amortization expense [Abstract] |  |  |
Total depreciation expense | 37 | 125 |
Assets by segment [Abstract] |  |  |
Total Assets | 7,221 |  | 8,644
Reportable Segment [Member] |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |
Operating income (loss) from identified segments | $ 2,149 | $ (4,967) |

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