Net Income per Share (Details Textual)	Jun. 30, 2012	Jun. 30, 2011
Net Income per Share (Textual) [Abstract]
Number of shares issued or committed for issuance under outstanding stock options	6,745,354	5,396,075
Number of shares of restricted stock and shares reserved for restricted stock units outstanding	837,104	964,882
Number of outstanding shares of Series D Cumulative Convertible Preferred Stock	27,000
Number of shares of common stock	6,065,075