Share-Based Compensation (Details Textual) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share-Based Compensation (Textual) [Abstract]
Stock-based compensation expense under share based plans	$ 298,000	$ 265,000	$ 1,005,000	$ 874,000
Cash received from employee stock purchase plan	230,000	111,000	470,000	345,000
Stock option exercises		0		0
Unrecognized compensation expense related to unvested portion of all share-based compensation	$ 2,300,000		$ 2,300,000
Expected weighted average recognition period for unrecognized compensation expense			1 year 3 months 18 days