Savings and Retirement Plan (Details Textual) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2005
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent				4.00%
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount	$ 196,000	$ 211,000	$ 143,000

Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration