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Summary of Significant Accounting Policies (Details 4) - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net Income Per Share        
Denominator for basic net income per share - weighted average shares 12,107,000 12,593,000 12,177,000 12,767,000
Effect of dilutive securities: Stock options and restricted stock units 134,000 231,000 174,000 236,000
Denominator for diluted net income per share - weighted average shares 12,241,000 12,824,000 12,351,000 13,003,000
Stock Options        
Net Income Per Share        
Options not included in computation because they were anti-dilutive 660,000 695,000 653,000 578,000
Weighted average exercise of price of options outstanding that were anti-dilutive $ 3.64 $ 4.20 $ 3.80 $ 4.27