Summary of Significant Accounting Policies (Details 4) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net Income per Share
Denominator for basic net income per share - weighted average shares	12,854,000	13,660,000	12,854,000	13,657,000
Effect of dilutive securities: Stock options and restricted stock units	239,000	27,000	238,000	29,000
Denominator for diluted net income per share - weighted average shares	13,093,000	13,687,000	13,092,000	13,686,000
Stock Options
Net Income per Share
Options not included in computation because they were anti-dilutive	579,000	1,155,000	519,000	1,239,000
Weighted average exercise of price of options outstanding that were anti-dilutive	$ 4.28	$ 3.19	$ 4.32	$ 3.33