Property and Equipment - Components of property and equipment, net (Details) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Property, Plant and Equipment [Abstract]
Land	$ 726	$ 726
Building and leasehold improvements	7,391	7,283
Furniture and equipment	11,180	10,955
Property, plant and equipment, gross	19,297	18,964
Accumulated depreciation and amortization	(15,367)	(15,110)
Total property and equipment, net	$ 3,930	$ 3,854