Stockholders' Equity Schedule of Stock by Class (Details) (Common Stock [Member])	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Common Stock [Member]
Class of Stock [Line Items]
Common Stock Outstanding at May 1	5,828,650	5,873,100
Restricted Stock Activity	(312,900)	0
Treasury Stock Activity	0	(44,450)
Common Stock Outstanding at April 30	5,515,750	5,828,650