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Summary of Significant Accounting Policies (Details 4) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Net Income per Share        
Denominator for basic net income per share - weighted average shares 12,593,000 13,230,000 12,767,000 13,515,000
Effect of dilutive securities: Stock options 231,000 140,000 236,000 66,000
Denominator for diluted net income per share - weighted average shares 12,824,000 13,370,000 13,003,000 13,581,000
Stock Options
        
Net Income per Share        
Options not included in computation because they were anti-dilutive 695,000 538,000 578,000 1,005,000
Weighted average exercise of price of options outstanding that were anti-dilutive $ 4.20 $ 4.20 $ 4.27 $ 3.48