Property and Equipment - Components of property and equipment, net (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013
Property, Plant and Equipment [Abstract]
Land	$ 726	$ 726
Building and leasehold improvements	5,024	7,391
Furniture and equipment	5,312	11,180
Property, plant and equipment, gross	11,062	19,297
Accumulated depreciation and amortization	(7,199)	(15,367)
Total property and equipment, net	$ 3,863	$ 3,930