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Summary of Significant Accounting Policies (Details 4) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net Income Per Share        
Denominator for basic net income per share - weighted average shares 12,213,000 12,854,000 12,212,000 12,854,000
Effect of dilutive securities: Stock options and restricted stock units 179,000 239,000 194,000 238,000
Denominator for diluted net income per share - weighted average shares 12,392,000 13,093,000 12,406,000 13,092,000
Stock Options        
Net Income Per Share        
Options not included in computation because they were anti-dilutive 628,000 579,000 650,000 519,000
Weighted average exercise of price of options outstanding that were anti-dilutive $ 3.79 $ 4.28 $ 3.89 $ 4.32