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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Segment
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]          
Number of reportable segments 2        
Segment Reporting Information, Results of operations [Abstract]          
Total interest expense $ 93 $ 68 $ 307 $ 222  
Operating income (loss) from identified segments (681) 403 715 (5,572)  
General and administrative expenses (2,030) (1,337) (5,169) (3,963)  
Add back Interest expenses 93 68 307 222  
Other revenues and expenses 618 (1,065) (472) (786)  
Income (loss) before income taxes and discontinued operations (63) (706) 243 (6,469)  
Depreciation depletion and amortization expense [Abstract]          
Total depreciation expense 4,689 3,272 11,702 10,086  
Assets by segment [Abstract]          
Total Assets 125,511   125,511   126,801
Corporate [Member]
          
Depreciation depletion and amortization expense [Abstract]          
Total depreciation expense 37 36 112 112  
Assets by segment [Abstract]          
Total Assets 7,205   7,205   8,644
Reportable Segment [Member]
          
Segment Reporting Information, Results of operations [Abstract]          
Total revenues 9,928 8,582 27,312 24,376  
Total operating expenses 8,579 6,886 21,428 26,096  
Total interest expense 93 68 307 222  
Operating income (loss) from identified segments 1,256 1,628 5,577 (1,942)  
Add back Interest expenses 93 68 307 222  
Reportable Segment [Member] | Oil and Gas [Member]
          
Segment Reporting Information, Results of operations [Abstract]          
Total revenues 9,928 8,582 27,312 24,376  
Total operating expenses 7,649 6,082 19,084 23,948  
Total interest expense 93 65 307 213  
Operating income (loss) from identified segments 2,186 2,435 7,921 215  
Add back Interest expenses 93 65 307 213  
Depreciation depletion and amortization expense [Abstract]          
Total depreciation expense 4,621 3,205 11,498 9,879  
Assets by segment [Abstract]          
Total Assets 96,364   96,364   97,418
Reportable Segment [Member] | Mineral properties [Member]
          
Segment Reporting Information, Results of operations [Abstract]          
Total operating expenses 930 804 2,344 2,148  
Total interest expense 0 3 0 9  
Operating income (loss) from identified segments (930) (807) (2,344) (2,157)  
Add back Interest expenses 0 3 0 9  
Depreciation depletion and amortization expense [Abstract]          
Total depreciation expense 31 31 92 95  
Assets by segment [Abstract]          
Total Assets $ 21,942   $ 21,942   $ 20,739