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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Segment
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Number of reportable segments 2    
Segment Reporting Information, Results of operations [Abstract]      
Total revenues $ 8,256 $ 7,879  
Total operating expenses 6,023 12,732  
Total interest expense 84 114  
Operating income (loss) from identified segments 627 (6,125)  
General and administrative expenses (1,606) (1,272)  
Add back Interest expenses 84 114  
Other revenues and expenses (377) (5)  
Income (loss) before income taxes and discontinued operations 250 (6,130)  
Depreciation depletion and amortization expense [Abstract]      
Total depreciation expense 3,362 3,798  
Assets by segment [Abstract]      
Total Assets 128,777   126,801
Oil and Gas [Member]
      
Segment Reporting Information, Results of operations [Abstract]      
Total revenues 8,256 7,879  
Total operating expenses 5,266 12,088  
Total interest expense 84 111  
Operating income (loss) from identified segments 2,906 (4,320)  
Add back Interest expenses 84 111  
Depreciation depletion and amortization expense [Abstract]      
Total depreciation expense 3,294 3,641  
Assets by segment [Abstract]      
Total Assets 99,614   97,418
Mineral properties [Member]
      
Segment Reporting Information, Results of operations [Abstract]      
Total operating expenses 757 644  
Total interest expense 0 3  
Operating income (loss) from identified segments (757) (647)  
Add back Interest expenses 0 3  
Depreciation depletion and amortization expense [Abstract]      
Total depreciation expense 31 32  
Assets by segment [Abstract]      
Total Assets 21,942   20,739
Corporate [Member]
      
Depreciation depletion and amortization expense [Abstract]      
Total depreciation expense 37 125  
Assets by segment [Abstract]      
Total Assets 7,221   8,644
Reportable Segment [Member]
      
Segment Reporting Information, Results of operations [Abstract]      
Operating income (loss) from identified segments $ 2,149 $ (4,967)