Stockholder's Equity (Details 1) (USD $)	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012
Employee Stock Purchase Plan shares issued
Price of Shares Issued under employee stock purchase plan	$ 17.60	$ 12.19
Employee [Member]
Employee Stock Purchase Plan shares issued
Shares available, Beginning Balance		111,432
Issuance of common stock under Employee Stock Purchase Plan, shares	12,318	15,556
Shares available, Ending Balance	83,558