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Share-Based Compensation (Details Textual) (USD $)	3 Months Ended		6 Months Ended
Share-Based Compensation (Details Textual) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-Based Compensation (Textual) [Abstract]
Stock-based compensation expense under share based plans	$ 359,000	$ 361,000	$ 706,000	$ 609,000
Cash received from employee stock purchase plan	115,000	104,000	240,000	233,000
Unrecognized compensation expense related to unvested portion of all share-based compensation	$ 2,000,000		$ 2,000,000
Expected weighted average recognition period for unrecognized compensation expense			1 year 3 months 18 days

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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