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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2014
Segment Information [Abstract]  
Summary of result of operations and total assets by segment
As of September 30, 2014, we had two reportable segments: Oil and Gas and Maintenance of Mineral Properties.  A summary of results of operations for the three and nine months ended September 30, 2014 and 2013, and total assets as of September 30, 2014 and December 31, 2013 by segment, are as follows:

         
  
(In thousands)
  
(In thousands)
 
  
For the three months ended September 30,
  
For the nine months ended September 30,
 
  
2014
  
2013
  
2014
  
2013
 
Revenues:
        
Oil and gas
 
$
9,928
  
$
8,582
  
$
27,312
  
$
24,376
 
Total revenues
  
9,928
   
8,582
   
27,312
   
24,376
 
                 
Operating expenses:
                
Oil and gas
  
7,649
   
6,082
   
19,084
   
23,948
 
Mineral properties
  
930
   
804
   
2,344
   
2,148
 
Total operating expenses
  
8,579
   
6,886
   
21,428
   
26,096
 
                 
Interest expense:
                
Oil and gas
  
93
   
65
   
307
   
213
 
Mineral properties
  
--
   
3
   
--
   
9
 
Total interest expense
  
93
   
68
   
307
   
222
 
                 
Operating income (loss)
                
Oil and gas
 
$
2,186
  
$
2,435
  
$
7,921
  
$
215
 
Mineral properties
  
(930
)
  
(807
)
  
(2,344
)
  
(2,157
)
Operating income (loss)
                
from identified segments
  
1,256
   
1,628
   
5,577
   
(1,942
)
                 
General and administrative expenses
  
(2,030
)
  
(1,337
)
  
(5,169
)
  
(3,963
)
Add back interest expense
  
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:
 
Oil and gas
 
$
4,621
  
$
3,205
  
$
11,498
  
$
9,879
 
Mineral properties
  
31
   
31
   
92
   
95
 
Corporate
  
37
   
36
   
112
   
112
 
Total depreciation expense
 
$
4,689
  
$
3,272
  
$
11,702
  
$
10,086
 

 
     
  
(In thousands)
 
  
June 30,
  
December 31,
 
  
2014
  
2013
 
Assets by segment
    
Oil and gas
 
$
96,364
  
$
97,418
 
Mineral
  
21,942
   
20,739
 
Corporate
  
7,205
   
8,644
 
Total assets
 
$
125,511
  
$
126,801