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SHAREHOLDERS' EQUITY (Tables) | 12 Months Ended
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Dec. 31, 2012
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, 2012, 2011 and 2010 is as follows:
|  | Year ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | Employee Options |  |  | Weighted Average Exercise Price |  |  | Employee Options |  |  | Weighted Average Exercise Price |  |  | Employee Options |  |  | Weighted Average Exercise Price |
Outstanding at beginning |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
of the period |  |  | 2,318,399 |  |  | $ | 3.94 |  |  |  | 3,011,647 |  |  | $ | 3.87 |  |  |  | 3,711,114 |  |  | $ | 3.64 |
Granted |  |  | 150,000 |  |  | $ | 2.32 |  |  |  | -- |  |  | $ | -- |  |  |  | -- |  |  | $ | -- |
Forfeited |  |  | (10,000 | ) |  | $ | 2.32 |  |  |  | -- |  |  | $ | -- |  |  |  | -- |  |  | $ | -- |
Expired |  |  | (194,950 | ) |  | $ | 4.47 |  |  |  | (200,000 | ) |  | $ | 3.90 |  |  |  | -- |  |  | $ | -- |
Exercised |  |  | (4,167 | ) |  | $ | 2.52 |  |  |  | (493,248 | ) |  | $ | 3.51 |  |  |  | (699,467 | ) |  | $ | 2.63 |
Outstanding at period end |  |  | 2,259,282 |  |  | $ | 3.80 |  |  |  | 2,318,399 |  |  | $ | 3.94 |  |  |  | 3,011,647 |  |  | $ | 3.87 |
Exercisable at period end |  |  | 2,119,282 |  |  | $ | 3.90 |  |  |  | 2,108,399 |  |  | $ | 3.84 |  |  |  | 2,404,148 |  |  | $ | 3.78 |
Weighted average fair |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
value of options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
granted during |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
the period |  |  |  |  |  | $ | 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, 2012:
Grant Price Range |  |  | Employee Options Outstanding at December 31, 2012 |  |  | Weighted average remaining contractual life in years |  |  | Weighted average exercise price |  |  | Employee Options exercisable at December 31, 2012 |  |  | Weighted average exercise price |
$ | 2.32 |  |  |  | 140,000 |  |  |  | 9.53 |  |  | $ | 2.32 |  |  |  | -- |  |  | $ | -- |
$ | 2.33 - $2.46 |  |  |  | 386,869 |  |  |  | 1.50 |  |  | $ | 2.46 |  |  |  | 386,869 |  |  | $ | 2.46 |
$ | 2.47 - $2.52 |  |  |  | 408,645 |  |  |  | 5.72 |  |  | $ | 2.52 |  |  |  | 408,645 |  |  | $ | 2.52 |
$ | 2.53 - $3.86 |  |  |  | 273,768 |  |  |  | 2.78 |  |  | $ | 3.86 |  |  |  | 273,768 |  |  | $ | 3.86 |
$ | 3.87 - $4.97 |  |  |  | 1,050,000 |  |  |  | 4.57 |  |  | $ | 4.97 |  |  |  | 1,050,000 |  |  | $ | 4.97 |
|  |  |  |  | 2,259,282 |  |  |  | 4.34 |  |  | $ | 3.82 |  |  |  | 2,119,282 |  |  | $ | 3.90 |
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:
|  | 2012 |  |  | 2011 |  |  | 2010 |
Available for future grant |  |  | 1,060,000 |  |  |  | -- |  |  |  | 3,765,506 |
Intrinsic value of option exercised |  | $ | 4,000 |  |  | $ | 888,000 |  |  | $ | 1,956,000 |
Aggregate intrinsic value of options outstanding |  | $ | -- |  |  | $ | 351,000 |  |  | $ | 6,660,000 |
Aggregate intrinsic value of options exercisable |  | $ | -- |  |  | $ | 351,000 |  |  | $ | 5,526,000 |
Director Stock Award Plan Activity | Director Option Plan. As of December 31, 2012, there were 150,000 director options outstanding to purchase shares of USE's common stock. Of the total outstanding options, 63,335 were exercisable. 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 periods ended December 31, 2012, 2011 and 2010 for director options is presented in the following table:
|  | Year ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
|  | Director Options |  |  | Weighted Average Exercise Price |  |  | Director Options |  |  | Weighted Average Exercise Price |  |  | Director Options |  |  | Weighted Average Exercise Price |
Outstanding at beginning |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
of the period |  |  | 210,000 |  |  | $ | 3.10 |  |  |  | 320,000 |  |  | $ | 2.95 |  |  |  | 581,367 |  |  | $ | 2.91 |
Granted |  |  | 80,000 |  |  | $ | 2.78 |  |  |  | 20,000 |  |  | $ | 4.19 |  |  |  | 10,000 |  |  | $ | 5.04 |
Forfeited |  |  | -- |  |  | $ | 2.52 |  |  |  | (20,000 | ) |  | $ | 2.52 |  |  |  | (20,000 | ) |  | $ | 2.52 |
Expired |  |  | (120,000 | ) |  | $ | 3.05 |  |  |  | (5,000 | ) |  | $ | 3.90 |  |  |  | -- |  |  | $ | -- |
Exercised |  |  | (20,000 | ) |  | $ | 2.52 |  |  |  | (105,000 | ) |  | $ | 2.92 |  |  |  | (251,367 | ) |  | $ | 2.97 |
Outstanding at period end |  |  | 150,000 |  |  | $ | 3.05 |  |  |  | 210,000 |  |  | $ | 3.10 |  |  |  | 320,000 |  |  | $ | 2.95 |
Exercisable at period end |  |  | 63,335 |  |  | $ | 3.01 |  |  |  | 183,334 |  |  | $ | 2.91 |  |  |  | 276,667 |  |  | $ | 2.93 |
Weighted average fair |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
value of options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
granted during |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
the period |  |  |  |  |  | $ | 1.59 |  |  |  |  |  |  | $ | 2.34 |  |  |  |  |  |  | $ | 2.99 |
Summary of Information About Directors Plan | The following table summarizes information about director options outstanding and exercisable at December 31, 2012:
Grant Price Range |  |  | Director Options Outstanding at December 31, 2012 |  |  | Weighted average remaining contractual life in years |  |  | Weighted average exercise price |  |  | Director Options exercisable at December 31, 2012 |  |  | Weighted average exercise price |
$ | 2.32 |  |  |  | 10,000 |  |  |  | 9.53 |  |  | $ | 2.32 |  |  |  | -- |  |  | $ | - |
$ | 2.33 - $2.52 |  |  |  | 40,000 |  |  |  | 5.72 |  |  | $ | 2.52 |  |  |  | 40,000 |  |  | $ | 2.52 |
$ | 2.53 - $2.85 |  |  |  | 70,000 |  |  |  | 9.22 |  |  | $ | 2.85 |  |  |  | 10,000 |  |  | $ | 2.85 |
$ | 2.86 - $4.19 |  |  |  | 20,000 |  |  |  | 8.48 |  |  | $ | 4.19 |  |  |  | 6,668 |  |  | $ | 4.19 |
$ | 4.20 - $5.04 |  |  |  | 10,000 |  |  |  | 7.48 |  |  | $ | 5.04 |  |  |  | 6,667 |  |  | $ | 5.04 |
|  |  |  |  | 150,000 |  |  |  | 8.10 |  |  | $ | 3.05 |  |  |  | 63,335 |  |  | $ | 3.01 |
Summary of Valuation Assumptions in Stock Option and Warrant Valuation | USE measures the cost of employee and director services received in exchange for all equity awards granted, including stock options, based on the fair market value of the award as of the grant date. USE computes the fair values of its options granted to employees using the Black Scholes pricing model and the following weighted average assumptions:
| Year Ended December 31,
| 2012 | 2011 | 2010
Risk-free interest rate | 0.82% to 1.41% | 1.77% | 2.24%
Expected lives (years) | 5.0 to 6.0 | 6.0 | 6.0
Expected volatility | 61.87% to 63.59% | 59.64% | 63.79%
Expected dividend yield | -- | -- | --

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