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SEGMENTS AND MAJOR CUSTOMERS (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2012 Segment | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,534 | $ 30,958 | $ 26,548
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 33,769 | 27,913 | 18,561
Total interest expenses |  |  |  |  |  |  |  |  |  |  |  |  | 193 | 304 | 48
Operating income (loss) from identified segments | (5,932) | (2,709) | (991) | (712) | (2,475) | 875 | 400 | (4,864) | (2,862) | (958) | (297) | 1,250 | (10,344) | (5,216) | (986)
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  | (9,109) | (8,261) | (8,973)
Add back Interest expenses |  |  |  |  |  |  |  |  |  |  |  |  | 193 | 304 | 48
Other revenues and expenses: |  |  |  |  |  |  |  |  |  |  |  |  | 849 | (717) | (332)
(Loss) income before income taxes and discontinued operations | (6,131) | (3,155) | 624 | (833) | (2,362) | 1,022 | 339 | (4,932) | (2,359) | (950) | (176) | 2,340 | (9,495) | (5,933) | (1,318)
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 15,456 | 14,593 | 11,067
Assets by segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 140,827 |  |  |  | 162,439 |  |  |  | 156,016 |  |  |  | 140,827 | 162,439 | 156,016
Oil and Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  | 32,534 | 30,958 | 26,548
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 30,870 | 25,549 | 16,683
Total interest expenses |  |  |  |  |  |  |  |  |  |  |  |  | 169 | 268 | 0
Operating income (loss) from identified segments |  |  |  |  |  |  |  |  |  |  |  |  | 1,495 | 5,141 | 9,865
Add back Interest expenses |  |  |  |  |  |  |  |  |  |  |  |  | 169 | 268 | 0
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 14,893 | 13,997 | 10,610
Assets by segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 93,839 |  |  |  | 109,141 |  |  |  | 75,639 |  |  |  | 93,839 | 109,141 | 75,639
Mineral properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating expenses |  |  |  |  |  |  |  |  |  |  |  |  | 2,899 | 2,364 | 1,878
Total interest expenses |  |  |  |  |  |  |  |  |  |  |  |  | 24 | 36 | 48
Operating income (loss) from identified segments |  |  |  |  |  |  |  |  |  |  |  |  | (2,923) | (2,400) | (1,926)
Add back Interest expenses |  |  |  |  |  |  |  |  |  |  |  |  | 24 | 36 | 48
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 127 | 102 | 77
Assets by segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 20,747 |  |  |  | 20,755 |  |  |  | 20,800 |  |  |  | 20,747 | 20,755 | 20,800
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation depletion and amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 436 | 494 | 380
Assets by segment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets | 26,241 |  |  |  | 32,543 |  |  |  | 59,577 |  |  |  | 26,241 | 32,543 | 59,577
Reportable Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Results of operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) from identified segments |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,428) | $ 2,741 | $ 7,939

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