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SHAREHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2014
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 years ended December 31, 2014, 2013 and 2012 is as follows:

  
Year ended December 31,
 
  
2014
  
2013
  
2012
 
   
Employee Options
  
Weighted Average Exercise Price
  
Employee Options
  
Weighted Average Exercise Price
  
Employee Options
  
Weighted Average Exercise Price
 
Outstanding at beginning
            
of the period
  
2,500,949
  
$
3.60
   
2,259,282
  
$
3.80
   
2,318,399
  
$
3.94
 
Granted
  
--
  
$
--
   
270,000
  
$
2.08
   
150,000
  
$
2.32
 
Forfeited
  
(3,333
)
 
$
2.08
   
--
  
$
--
   
(10,000
)
 
$
2.32
 
Expired
  
--
  
$
--
   
(28,333
)
 
$
4.68
   
(194,950
)
 
$
4.47
 
Exercised
  
(400,203
)
 
$
2.46
   
-
  
$
-
   
(4,167
)
 
$
2.52
 
Outstanding at period end
  
2,097,413
  
$
3.82
   
2,500,949
  
$
3.60
   
2,259,282
  
$
3.80
 
Exercisable at period end
  
1,949,080
  
$
3.95
   
2,137,619
  
$
3.85
   
2,119,282
  
$
3.90
 
                         
Weighted average fair
                        
value of options
                        
granted during
                        
the period
     
$
--
      
$
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, 2014:


Grant Price Range
  
Employee Options Outstanding at December 31, 2014
  
Weighted average remaining contractual life in years
  
Weighted average exercise price
  
Employee Options exercisable at December 31, 2014
  
Weighted average exercise price
 
           
$
2.08
   
270,000
   
8.74
  
$
2.08
   
166,668
  
$
2.08
 
$
2.09 - $2.32
   
123,333
   
7.53
  
$
2.32
   
78,332
  
$
2.32
 
$
2.33 - $2.52
   
405,312
   
3.73
  
$
2.52
   
405,312
  
$
2.52
 
$
2.53 - $3.86
   
273,768
   
0.79
  
$
3.86
   
273,768
  
$
3.86
 
$
3.87 - $4.97
   
1,025,000
   
2.57
  
$
4.97
   
1,025,000
  
$
4.97
 
     
2,097,413
   
3.65
  
$
3.82
   
1,949,080
  
$
3.95
 
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,
 
  
2014
  
2013
  
2012
 
Available for future grant
  
790,000
   
790,000
   
1,060,000
 
Aggregate intrinsic value of options outstanding
 
$
--
  
$
1,661,000
  
$
--
 
Aggregate intrinsic value of options exercisable
 
$
--
  
$
1,073,000
  
$
--
 
Director Stock Award Plan Activity
Activity for the years ended December 31, 2014, 2013 and 2012 for director options is presented in the following table:


  
Year ended December 31,
 
  
2014
  
2013
  
2012
 
   
Director Options
  
Weighted Average Exercise Price
  
Director Options
  
Weighted Average Exercise Price
  
Director Options
  
Weighted Average Exercise Price
 
Outstanding at beginning
            
of the period
  
146,000
  
$
2.93
   
150,000
  
$
3.05
   
210,000
  
$
3.10
 
Granted
  
60,000
  
$
3.77
   
36,000
  
$
2.08
   
80,000
  
$
2.78
 
Forfeited
  
--
  
$
--
   
--
  
$
--
   
--
  
$
--
 
Expired
  
--
  
$
--
   
(40,000
)
 
$
2.60
   
(120,000
)
 
$
3.05
 
Exercised
  
(27,334
)
 
$
2.53
   
-
  
$
-
   
(20,000
)
 
$
2.52
 
Outstanding at period end
  
178,666
  
$
3.28
   
146,000
  
$
2.93
   
150,000
  
$
3.05
 
Exercisable at period end
  
82,333
  
$
3.30
   
56,668
  
$
3.46
   
63,335
  
$
3.01
 
                         
Weighted average fair
                        
value of options
                        
granted during
                        
the period
     
$
2.27
      
$
1.20
      
$
1.59
 
Summary of Information About Directors Plan
The following table summarizes information about director options outstanding and exercisable at December 31, 2014:


Grant Price Range
  
Director Options Outstanding at December 31, 2014
  
Weighted average remaining contractual life in years
  
Weighted average exercise price
  
Director Options exercisable at December 31, 2014
  
Weighted average exercise price
 
           
$
2.08
   
27,000
   
8.50
  
$
2.08
   
9,000
  
$
2.08
 
$
2.09 - $2.32
   
6,666
   
7.53
  
$
2.32
   
3,333
  
$
2.32
 
$
2.33 - $2.52
   
10,000
   
3.73
  
$
2.52
   
10,000
  
$
2.52
 
$
2.53 - $2.85
   
45,000
   
7.23
  
$
2.85
   
30,000
  
$
2.85
 
$
2.86 - $4.19
   
80,000
   
8.90
  
$
3.88
   
20,000
  
$
4.19
 
$
4.20 - $5.04
   
10,000
   
5.48
  
$
5.04
   
10,000
  
$
5.04
 
                       
     
178,666
   
7.88
  
$
3.28
   
82,333
  
$
3.30
 
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,
 
  
2014
  
2013
  
2012
 
Available for future grant
  
101,811
   
131,359
   
126,526
 
             
Aggregate intrinsic value of options outstanding
 
$
--
  
$
142,000
  
$
--
 
Aggregate intrinsic value of options exercisable
 
$
--
  
$
35,000
  
$
--
 
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,
 
2014
2013
2012
Risk-free interest rate
2.06%
1.66%
0.82% to 1.41%
Expected lives (years)
 6.0
 6.0
 5.0 to 6.0
Expected volatility
65.45%
62.59%
61.87% to 63.59%
Expected dividend yield
 --
 --
 --