Subsequent Events (Details) (USD $)	Apr. 30, 2012	Apr. 30, 2011
Common Class A [Member]
Subsequent Events (Textual) [Abstract]
Common stock, par value	$ 0.15	$ 0.15
Common stock, shares authorized	57,000,000	57,000,000
Increase in authorized capital	85,000,000
Common stock, Class B, nonvoting
Subsequent Events (Textual) [Abstract]
Common stock, par value	$ 0.15	$ 0.15
Common stock, shares authorized	100,000,000	100,000,000
Increase in authorized capital	400,000,000