Stockholders' Equity (Details Textual 1) (Share Purchase Rights Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2011
Share Purchase Rights Plan [Member]
Stockholders Equity (Textual 1) [Abstract]
Title of Rights	preferred share purchase right
Number of Series A Preferred Shares called by one Right, in shares	0.01
Exercise price on one Right	$ 225.00
Reason for issuing rights	anti-takeover effects