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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments |  |  | 2 |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total revenues | $ 7,639 | $ 8,408 | $ 24,496 | $ 22,112 |
Total operating expenses | 6,933 | 7,268 | 21,839 | 20,214 |
Total interest expenses | 53 | 69 | 128 | 207 |
Operating income (loss) from identified segments | (2,709) | (689) | (4,412) | (4,480) |
General and administrative expenses | (3,415) | (1,829) | (7,069) | (6,378) |
Add back Interest expenses | 53 | 69 | 128 | 207 |
Other revenues and expenses: | (446) | 1,711 | 1,048 | 909 |
Loss before income taxes | (3,155) | 1,022 | (3,364) | (3,571) |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation expense | 3,561 | 4,009 | 11,542 | 10,215 |
Assets by segment [Abstract] |  |  |  |  |
Total assets | 148,186 |  | 148,186 |  | 162,439
Oil and Gas [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total revenues | 7,639 | 8,408 | 24,496 | 22,112 |
Total operating expenses | 5,924 | 6,505 | 19,569 | 18,444 |
Total interest expenses | 45 | 52 | 103 | 81 |
Operating income (loss) from identified segments | 1,670 | 1,851 | 4,824 | 3,587 |
Add back Interest expenses | 45 | 52 | 103 | 81 |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation expense | 3,410 | 3,862 | 11,081 | 9,767 |
Assets by segment [Abstract] |  |  |  |  |
Total assets | 98,041 |  | 98,041 |  | 109,141
Mineral properties [Member] |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |
Total operating expenses | 1,009 | 763 | 2,270 | 1,770 |
Total interest expenses | 6 | 9 | 18 | 27 |
Operating income (loss) from identified segments | (1,015) | (772) | (2,288) | (1,797) |
Add back Interest expenses | 6 | 9 | 18 | 27 |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation expense | 31 | 26 | 95 | 77 |
Assets by segment [Abstract] |  |  |  |  |
Total assets | 20,754 |  | 20,754 |  | 20,755
Corporate [Member] |  |  |  |  |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |
Total depreciation expense | 120 | 121 | 365 | 371 |
Assets by segment [Abstract] |  |  |  |  |
Total assets | $ 29,391 |  | $ 29,391 |  | $ 32,543

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