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SEGMENTS AND MAJOR CUSTOMERS (Tables)
 12 Months Ended
Dec. 31, 2012
SEGMENTS AND MAJOR CUSTOMERS [Abstract]  
Summary of Result of Operations and Total Assets by Segment
During the years ended December 31, 2012, 2011, and 2010, USE, for financial reporting purposes, operated two business segments, the exploration for and sale of oil and gas, and mining. USE's operating segments are reflected in the tables below:
 
   
(In thousands)
 
   
For the years ended December 31,
 
   
2012
  
2011
  
2010
 
Revenues:
         
Oil and gas
 $32,534  $30,958  $26,548 
Total revenues:
  32,534   30,958   26,548 
              
Operating expenses:
            
Oil and gas
  30,870   25,549   16,683 
Mineral properties
  2,899   2,364   1,878 
Total operating expenses:
  33,769   27,913   18,561 
              
Interest expense
            
Oil and gas
  169   268   -- 
Mineral properties
  24   36   48 
Total interest expense:
  193   304   48 
              
Operating (loss) income
            
Oil and gas
 $1,495  $5,141  $9,865 
Mineral properties
  (2,923)  (2,400)  (1,926)
Operating income (loss)
            
from identified segments
  (1,428)  2,741   7,939 
              
General and administrative expenses
  (9,109)  (8,261)  (8,973)
Add back interest expense
  193   304   48 
Other revenues and expenses:
  849   (717)  (332)
              
(Loss) income before income taxes
 $(9,495) $(5,933) $(1,318)
              
Depreciation depletion and amortization expense:
         
Oil and gas
 $14,893  $13,997  $10,610 
Mineral properties
  127   102   77 
Corporate
  436   494   380 
Total depreciation expense
 $15,456  $14,593  $11,067 
              

   
(In thousands)
 
   
December 31,
  
December 31,
  
December 31,
 
   
2012
  
2011
  
2010
 
Assets by segment
         
Oil and gas
 $93,839  $109,141  $75,639 
Mineral
  20,747   20,755   20,800 
Corporate
  26,241   32,543   59,577 
Total assets
 $140,827  $162,439  $156,016