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Note D - Property and Equipment - Property and Equipment (Details) - USD ($)
$ in Thousands
Jul. 31, 2020
Apr. 30, 2020
Less accumulated depreciation and amortization $ (35,812) $ (35,160)
Total 32,053 30,140
Land [Member]    
Property and equipment 7,799 7,799
Building and Building Improvements [Member]    
Property and equipment 12,678 12,678
Furniture, Fixtures and Equipment [Member]    
Property and equipment 14,025 14,118
Leasehold Improvements [Member]    
Property and equipment 27,357 27,519
Construction in Progress [Member]    
Property and equipment $ 6,006 $ 3,186