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SHAREHOLDERS' EQUITY (Tables)

12 Months Ended

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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