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Note D - Property and Equipment - Property and Equipment (Details) - USD ($)
$ in Thousands
Jul. 31, 2018
Apr. 30, 2018
Less accumulated depreciation and amortization $ (29,062) $ (28,077)
Total 28,294 28,594
Land [Member]    
Property and equipment 6,402 6,402
Building and Building Improvements [Member]    
Property and equipment 11,594 11,569
Furniture, Fixtures and Equipment [Member]    
Property and equipment 13,134 12,874
Leasehold Improvements [Member]    
Property and equipment 24,834 24,567
Construction in Progress [Member]    
Property and equipment $ 1,392 $ 1,259