Note D - Property and Equipment (Details) - Property and Equipment (USD $) In Thousands, unless otherwise specified	Apr. 30, 2015	Apr. 30, 2014
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (19,535)	$ (15,843)
	33,963	33,913
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	6,245	6,330
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	11,509	11,116
Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	13,486	10,293
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	21,023	19,673
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 1,235	$ 2,344