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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Segment
Jun. 30, 2013
Jun. 30, 2014
Jun. 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 $ 130 $ 72 $ 214 $ 172  
Operating income (loss) from identified segments 769 151 1,396 (5,974)  
General and administrative expenses (1,533) (1,286) (3,139) (2,558)  
Add back Interest expenses 130 72 214 172  
Other revenues and expenses (713) 216 (1,090) 211  
Income (loss) before income taxes and discontinued operations 56 367 306 (5,763)  
Depreciation depletion and amortization expense [Abstract]          
Total depreciation expense 3,651 3,282 7,013 6,814  
Assets by segment [Abstract]          
Total Assets 124,634   124,634   126,801
Corporate [Member]
          
Depreciation depletion and amortization expense [Abstract]          
Total depreciation expense 38 37 75 76  
Assets by segment [Abstract]          
Total Assets 7,299   7,299   8,644
Reportable Segment [Member]
          
Segment Reporting Information, Results of operations [Abstract]          
Total revenues 9,128 7,915 17,384 15,794  
Total operating expenses 6,826 6,478 12,849 19,210  
Total interest expense 130 72 214 172  
Operating income (loss) from identified segments 2,172 1,365 4,321 (3,588)  
Add back Interest expenses 130 72 214 172  
Reportable Segment [Member] | Oil and Gas [Member]
          
Segment Reporting Information, Results of operations [Abstract]          
Total revenues 9,128 7,915 17,384 15,794  
Total operating expenses 6,169 5,778 11,435 17,866  
Total interest expense 130 72 214 148  
Operating income (loss) from identified segments 2,829 2,065 5,735 (2,220)  
Add back Interest expenses 130 72 214 148  
Depreciation depletion and amortization expense [Abstract]          
Total depreciation expense 3,583 3,213 6,877 6,674  
Assets by segment [Abstract]          
Total Assets 95,393   95,393   97,418
Reportable Segment [Member] | Mineral properties [Member]
          
Segment Reporting Information, Results of operations [Abstract]          
Total operating expenses 657 700 1,414 1,344  
Total interest expense 0 0 0 24  
Operating income (loss) from identified segments (657) (700) (1,414) (1,368)  
Add back Interest expenses 0 0 0 24  
Depreciation depletion and amortization expense [Abstract]          
Total depreciation expense 30 32 61 64  
Assets by segment [Abstract]          
Total Assets $ 21,942   $ 21,942   $ 20,739