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Stockholders' Equity (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Y
Dec. 31, 2010
Y
Dec. 31, 2009
Y
Valuation assumptions of granted stock options      
Weighted-average risk-free interest rate 1.21%    
Dividend yield 0.00%    
Weighted-average expected volatility 48.59%    
Total weighted-average expected forfeiture rate 2.97%    
Weighted-average expected life (years) 5.90    
Total weighted-average remaining vesting period in years 4.30 4.57 5.60
Total fair value of options granted $ 4,064,000    
Stock-based compensation expense - Cost of Sales $ 60,000 $ 42,000 $ 44,000
Stock-based compensation expense - SG&A 1,039,000 963,000 977,000
Income tax benefit $ (390,000) $ (402,000) $ (408,000)
2008 Plan [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of securities for issuance 1,000,000    
Number of awards available to be granted 344,370    
Number of qualified options outstanding 505,330    
Number of qualified options exercisable 78,065    
1998 Plan [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of qualified options outstanding 11,000    
Number of qualified options exercisable 11,000