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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Segment
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Number of operating segments 2    
Segment Reporting Information, Results of operations [Abstract]      
Total revenues $ 7,879 $ 8,335  
Total operating expenses 12,732 7,153  
Total interest expenses 100 36  
Operating income (loss) from identified segments (6,160) (712)  
General and administrative expenses (1,307) (1,894)  
Add back Interest expenses 100 36  
Other revenues and expenses: 30 (121)  
(Loss) income before income taxes and discontinued operations (6,130) (833)  
Depreciation depletion and amortization expense [Abstract]      
Total depreciation expense 3,532 3,798  
Assets by segment [Abstract]      
Total Assets 135,565 140,827 140,827
Oil and Gas [Member]
      
Segment Reporting Information, Results of operations [Abstract]      
Total revenues 7,879 8,335  
Total operating expenses 12,088 6,534  
Total interest expenses 76 30  
Operating income (loss) from identified segments (4,285) 1,771  
Add back Interest expenses 76 30  
Depreciation depletion and amortization expense [Abstract]      
Total depreciation expense 3,461 3,641  
Assets by segment [Abstract]      
Total Assets 88,812 93,839  
Mining properties [Member]
      
Segment Reporting Information, Results of operations [Abstract]      
Total operating expenses 644 619  
Total interest expenses 24 6  
Operating income (loss) from identified segments (668) (625)  
Add back Interest expenses 24 6  
Depreciation depletion and amortization expense [Abstract]      
Total depreciation expense 32 32  
Assets by segment [Abstract]      
Total Assets 20,746 20,747  
Corporate [Member]
      
Depreciation depletion and amortization expense [Abstract]      
Total depreciation expense 39 125  
Assets by segment [Abstract]      
Total Assets 26,007 26,241  
Reportable Segment [Member]
      
Segment Reporting Information, Results of operations [Abstract]      
Operating income (loss) from identified segments $ (4,953) $ 1,146