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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Segment Reporting Information [Line Items]          
Number of reportable segments     2    
Segment Reporting Information, Results of operations [Abstract]          
Total Revenues $ 8,522 $ 7,025 $ 16,857 $ 13,704  
Total Interest expenses 36 34 75 57  
Operating income (loss) from identified segments (991) (723) (1,703) (3,791)  
General and administrative expenses (1,760) (2,138) (3,654) (4,549)  
Add back Interest expenses 36 34 75 57  
Other revenues and expenses: 1,615 1,143 1,494 (721)  
Income (loss) before income taxes and discontinued operations 624 420 (209) (4,512)  
Depreciation depletion and amortization expense [Abstract]          
Total depreciation expense 4,182 3,269 7,980 6,206  
Assets by segment [Abstract]          
Total Assets 147,283   147,283   162,439
Oil and Gas [Member]
          
Segment Reporting Information, Results of operations [Abstract]          
Total Revenues 8,522 7,025 16,857 13,704  
Total operating Expenses 7,111 5,075 13,645 11,939  
Total Interest expenses 28 20 58 29  
Operating income (loss) from identified segments 1,383 1,930 3,154 1,736  
Add back Interest expenses 28 20 58 29  
Depreciation depletion and amortization expense [Abstract]          
Total depreciation expense 4,030 3,120 7,671 5,905  
Assets by segment [Abstract]          
Total Assets 94,311   94,311   109,141
Mineral properties [Member]
          
Segment Reporting Information, Results of operations [Abstract]          
Total operating Expenses 642 535 1,261 1,007  
Total Interest expenses 6 9 12 18  
Operating income (loss) from identified segments (648) (544) (1,273) (1,025)  
Add back Interest expenses 6 9 12 18  
Depreciation depletion and amortization expense [Abstract]          
Total depreciation expense 32 25 64 51  
Assets by segment [Abstract]          
Total Assets 20,754   20,754   20,755
Corporate [Member]
          
Depreciation depletion and amortization expense [Abstract]          
Total depreciation expense 120 124 245 250  
Assets by segment [Abstract]          
Total Assets 32,217   32,217   32,543
Reportable Segment [Member]
          
Segment Reporting Information, Results of operations [Abstract]          
Total Revenues 8,522 7,025 16,857 13,704  
Total operating Expenses 7,753 5,610 14,906 12,946  
Total Interest expenses 34 29 70 47  
Operating income (loss) from identified segments 735 1,386 1,881 711  
Add back Interest expenses $ 34 $ 29 $ 70 $ 47