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SHAREHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2013
SHAREHOLDERS' EQUITY [Abstract]  
Summary of Employee Stock Option Plans activity in all plans
A summary of the Employee Stock Option Plans activity in all plans for the year ended December 31, 2013, 2012 and 2011 is as follows:
 
   For the years ended December 31, 
   
2013
  
2012
  
2011
 
   
Employee Options
  
Weighted Average Exercise Price
  
Employee Options
  
Weighted Average Exercise Price
  
Employee Options
  
Weighted Average Exercise Price
 
Outstanding at beginning
                  
of the year
  2,259,282  $3.80   2,318,399  $3.94   3,011,647  $3.87 
Granted
  270,000  $2.08   150,000  $2.32   --  $-- 
Forfeited
  --  $--   (10,000) $2.32   --  $-- 
Expired
  (28,333) $4.68   (194,950) $4.47   (200,000) $3.90 
Exercised
  --  $--   (4,167) $2.52   (493,248) $3.51 
Outstanding at year end
  2,500,949  $3.60   2,259,282  $3.80   2,318,399  $3.94 
Exercisable at year end
  2,137,619  $3.85   2,119,282  $3.90   2,108,399  $3.84 
                          
Weighted average fair
                        
value of options
                        
granted during
                        
the year
     $1.20      $1.30      $-- 
                          
Summary of Information about Employee Stock Options Outstanding and Exercisable
The following table summarizes information about employee stock options outstanding and exercisable at December 31, 2013:

Grant Price Range
  
Employee Options Outstanding at December 31, 2013
  
Weighted average remaining contractual life in years
  
Weighted average exercise price
  
Employee Options exercisable at December 31, 2013
  
Weighted average exercise price
 
                 
$2.08   270,000   9.50  $2.08   --  $-- 
$2.09 - $2.32   140,000   8.53  $2.32   46,670  $2.32 
$2.33 - $2.46   386,869   0.50  $2.46   386,869  $2.46 
$2.47 - $2.52   405,312   4.73  $2.52   405,312  $2.52 
$2.53 - $3.86   273,768   1.79  $3.86   273,768  $3.86 
$3.87 - $4.97   1,025,000   3.57  $4.97   1,025,000  $4.97 
     2,500,949   4.00  $3.60   2,137,619  $3.85 
                       
 
Summary of Number of Options Available For Grant and Intrinsic Value of Options Outstanding
The following table sets forth the number of options available for grant as well as the intrinsic value of the options outstanding and exercisable at:

           
   At December 31, 
   
2013
  
2012
  
2011
 
Available for future grant
  790,000   1,060,000   -- 
Intrinsic value of options exercised
 $--  $4,000  $888,000 
Aggregate intrinsic value of options outstanding
 $1,661,000  $--  $351,000 
Aggregate intrinsic value of options exercisable
 $1,073,000  $--  $351,000 
              
 
Director Stock Award Plan Activity
Director Option Plan.  As of December 31, 2013, there were 146,000 director options outstanding to purchase shares of USE's common stock.  USE values these options using the Black-Scholes option pricing model and expenses that value over various terms based on the nature of the award.  Activity for the years ended December 31, 2013, 2012 and 2011 for director options is presented in the following table:
 
   For the years ended December 31, 
   
2013
     
2012
     
2011
    
   
Director Options
  
Weighted Average Exercise Price
  
Director Options
  
Weighted Average Exercise Price
  
Director Options
  
Weighted Average Exercise Price
 
Outstanding at beginning
                  
of the period
  150,000  $3.05   210,000  $3.10   320,000  $2.95 
Granted
  36,000  $2.08   80,000  $2.78   20,000  $4.19 
Forfeited
  --  $--   --  $--   (20,000) $2.52 
Expired
  (40,000) $2.60   (120,000) $3.05   (5,000) $3.90 
Exercised
  --  $--   (20,000) $2.52   (105,000) $2.92 
Outstanding at period end
  146,000  $2.93   150,000  $3.05   210,000  $3.10 
Exercisable at period end
  56,668  $3.46   63,335  $3.01   183,334  $2.91 
                          
Weighted average fair
                        
value of options
                        
granted during
                        
the period
     $1.20      $1.59      $2.34 
                          
 
Summary of Information About Directors Plan
The following table summarizes information about director options outstanding and exercisable at December 31, 2013:
 
Grant Price Range
  
Director Options Outstanding at December 31, 2013
  
Weighted average remaining contractual life in years
  
Weighted average exercise price
  
Director Options exercisable at December 31, 2013
  
Weighted average exercise price
 
                 
$2.08   36,000   9.50  $2.08   --  $-- 
$2.09 - $2.32   10,000   8.53  $2.32   3,334  $2.32 
$2.33 - $2.52   10,000   4.73  $2.52   10,000  $2.52 
$2.53 - $2.85   60,000   8.22  $2.85   20,000  $2.85 
$2.86 - $4.19   20,000   7.48  $4.19   13,334  $4.19 
$4.20 - $5.04   10,000   6.48  $5.04   10,000  $5.04 
                       
     146,000   8.10  $2.93   56,668  $3.46 
                       
 
Summary of Director Options Available For Grant and Intrinsic Value of Options Outstanding
The following table sets forth the number of options available for grant as well as the intrinsic value of the options outstanding and exercisable at:

   
At December 31,
 
   
2013
  
2012
  
2011
 
Available for future grant
  131,359   126,526   164,099 
Intrinsic value of options exercised
 $--  $17,000  $14,000 
Aggregate intrinsic value of options outstanding
 $142,000  $--  $31,000 
Aggregate intrinsic value of options exercisable
 $35,000  $--  $31,000 
Summary of Valuation Assumptions in Stock Option and Warrant Valuation
USE has computed the fair values of its employee and director options using the Black Scholes pricing model and the following weighted average assumptions:

 
For the years ended December 31,
 
2013
2012
2011
Risk-free interest rate
1.66%
0.82% to 1.41%
1.77%
Expected lives (years)
 6.0
 5.0 to 6.0
 6.0
Expected volatility
62.59%
61.87% to 63.59%
59.64%
Expected dividend yield
 --
 --
 --