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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