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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2011

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Valuation assumptions of granted stock options

		2011				2010				2009
Weighted-average risk-free interest rate			1.21	%			N/A				N/A
Dividend yield			—				N/A				N/A
Weighted-average expected volatility			48.59	%			N/A				N/A
Total weighted-average expected forfeiture rate			2.97	%			N/A				N/A
Weighted-average expected life (years)			5.90				N/A				N/A
Total weighted-average remaining vesting period in years (1)			4.30				4.57				5.60
Total fair value of options granted		$	4,064,000				N/A				N/A
Stock-based compensation expense — Cost of sales (1)		$	60,000			$	42,000			$	44,000
Stock-based compensation expense — SG&A (1)		$	1,039,000			$	963,000			$	977,000
Income tax benefit (1)		$	(390,000	)		$	(402,000	)		$	(408,000	)

(1) Information relates to stock options granted since 2006.

Stock option activities of stock option plans

		December 31,
		2011
		2008 Plan				1998 Plan
Maximum number of securities for issuance			1,000,000				N/A
Number of awards available to be granted			344,370				N/A
Number of qualified options outstanding			505,330				11,000
Number of qualified options exercisable			78,065				11,000

		2011
						Weighted-Average
		Shares				Exercise Price
Outstanding at beginning of year			389,026			$	8.41
Granted			249,000			$	34.41
Exercised			(114,996	)		$	6.54
Cancelled, forfeited or expired			(6,700	)		$	9.69
Outstanding at end of year			516,330			$	21.34
Exercisable at end of year			89,065			$	8.85

		2011				2010				2009
Weighted-average fair value per option granted during year		$	16.00				N/A			$	N/A
Total intrinsic value of options exercised during the year		$	3,294,000			$	441,000			$	3,051,000
Total fair value of options vested during the year		$	208,000			$	214,000			$	220,000

		2011
						Weighted-Average
		Shares				Exercise Price
Outstanding at beginning of year			374,600			$	7.83
Granted			5,000			$	34.50
Exercised			(63,075	)		$	7.05
Surrendered, forfeited, or expired			—
Outstanding at end of year			316,525			$	8.41
Exercisable at end of year			66,325			$	7.97

		2011				2010				2009
Weighted-average fair value per option granted during year		$	16.25				N/A				N/A
Total intrinsic value of options exercised during the year		$	2,110,000			$	805,000			$	2,201,000
Total fair value of options vested during the year		$	730,000			$	721,000			$	721,000

Stock options outstanding and exercisable

The following table summarizes information about qualified stock options outstanding and exercisable at December 31, 2011:

		Stock Options Outstanding
						Weighted-
						Average				Weighted-				Intrinsic
						Remaining				Average				Value of
		Shares				Contractual Life				Exercise				Shares
Exercise Prices		Outstanding				in Years				Price				Outstanding
$5.10			11,000				3.92			$	5.10			$	252,000
$7.86 — $8.17			48,375				6.95			$	7.87			$	976,000
$9.69 — $9.97			207,955				6.83			$	9.69			$	3,813,000
$29.99 — $34.50			249,000				9.90			$	34.41			$	—
$5.10 — $34.50			516,330				8.26			$	21.34			$	5,041,000

		Stock Options Exercisable
						Weighted-
						Average				Weighted-				Intrinsic
						Remaining				Average				Value of
		Shares				Contractual Life				Exercise				Shares
Exercise Prices		Exercisable				in Years				Price				Exercisable
$5.10			11,000				3.92			$	5.10			$	252,000
$7.86 — $8.17			13,530				6.94			$	7.87			$	273,000
$9.69 — $9.97			64,535				6.83			$	9.69			$	1,184,000
$29.99 — $34.50			—
$5.10 — $34.50			89,065				6.49			$	8.85			$	1,709,000

		Stock Options Outstanding
						Weighted-
						Average				Weighted-				Intrinsic
						Remaining				Average				Value of
		Shares				Contractual Life				Exercise				Shares
Exercise Prices		Outstanding				in Years				Price				Outstanding
$7.86			36,525				6.92			$	7.86			$	737,000
$8.01			275,000				4.75			$	8.01			$	5,505,000
$34.50			5,000				9.92			$	34.50			$	—
$7.86 — $34.50			316,525				5.08			$	8.41			$	6,242,000

		Stock Options Exercisable
						Weighted-
						Average				Weighted-				Intrinsic
						Remaining				Average				Value of
		Shares				Contractual Life				Exercise				Shares
Exercise Prices		Exercisable				in Years				Price				Exercisable
$7.86			16,325				6.92			$	7.86			$	329,000
$8.01			50,000				4.75			$	8.01			$	1,001,000
$34.50			—
$7.86 — $34.50			66,325				5.28			$	7.97			$	1,330,000

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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