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Note D - Property and Equipment - Property and Equipment (Details) - USD ($)
$ in Thousands
Oct. 31, 2018
Apr. 30, 2018
Less accumulated depreciation and amortization $ (29,944) $ (28,077)
Total 28,155 28,594
Land [Member]    
Property and equipment 6,402 6,402
Building and Building Improvements [Member]    
Property and equipment 11,889 11,569
Furniture, Fixtures and Equipment [Member]    
Property and equipment 13,151 12,874
Leasehold Improvements [Member]    
Property and equipment 25,001 24,567
Construction in Progress [Member]    
Property and equipment $ 1,656 $ 1,259