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Note D - Property and Equipment - Property and Equipment (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Apr. 30, 2020
Accumulated depreciation and amortization $ (37,864) $ (35,160)
Property and equipment, net 34,719 30,140
Land [Member]    
Property and equipment 7,594 7,799
Building and Building Improvements [Member]    
Property and equipment 13,717 12,678
Furniture, Fixtures and Equipment [Member]    
Property and equipment 15,401 14,118
Leasehold Improvements [Member]    
Property and equipment 33,450 27,519
Construction in Progress [Member]    
Property and equipment $ 2,421 $ 3,186