Shareholder Rights Plan (Details Textual) (USD $)			0 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Nov. 23, 2007 Series A Junior Participating Preferred Stock [Member]
Preferred Stock, Voting Rights			Each Right is nominally exercisable, upon the occurrence of certain events, for one one-thousandth of a share
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Preferred Stock Purchase Price Per Unit			125.00