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Summary of Significant Accounting Policies (Details 4) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net Income per Share    
Denominator for basic net income per share - weighted average shares 12,853,000 13,654,000
Effect of dilutive securities: Stock options 238,000 30,000
Denominator for diluted net income per share - weighted average shares 13,091,000 13,684,000
Options
    
Net Income per Share    
Options not included in computation because they were anti-dilutive 459,000 1,322,000
Weighted average exercise of price of options outstanding that were anti-dilutive $ 4.36 $ 3.45