Restricted Stock Forfeiture Details (Details) (Common Stock [Member], Restricted Stock [Member], 2007 Agreement [Member], USD $)	9 Months Ended	12 Months Ended
	Jan. 31, 2013	Apr. 30, 2012
Common Stock [Member] | Restricted Stock [Member] | 2007 Agreement [Member]
Forfeiture Details [Line Items]
Restricted Stock Forfeiture Recovery	$ 42,000	$ 117,000