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Note D - Property and Equipment - Property and Equipment (Details) - USD ($)
$ in Thousands
Apr. 30, 2018
Apr. 30, 2017
Accumulated depreciation and amortization $ (28,077) $ (26,182)
Property and equipment, net 28,594 30,139
Land [Member]    
Property and equipment 6,402 6,742
Building and Building Improvements [Member]    
Property and equipment 11,569 11,972
Furniture, Fixtures and Equipment [Member]    
Property and equipment 12,874 13,143
Leasehold Improvements [Member]    
Property and equipment 24,567 24,464
Construction in Progress [Member]    
Property and equipment $ 1,259