Stockholders' Equity Schedule of Stock by Class (Details) (Common Stock [Member])	9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Common Stock [Member]
Class of Stock [Line Items]
Common Stock Outstanding at May 1	5,515,750	5,828,650
Restricted Stock Activity	0	312,900
Treasury Stock Activity	0	0
Common Stock Outstanding at April 30	5,515,750	5,515,750