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Note D - Property and Equipment - Property and Equipment (Details) - USD ($)
$ in Thousands
Apr. 30, 2019
Apr. 30, 2018
Accumulated depreciation and amortization $ (31,585) $ (28,077)
Property and equipment, net 28,537 28,594
Land [Member]    
Property and equipment 7,413 6,402
Building and Building Improvements [Member]    
Property and equipment 11,815 11,569
Furniture, Fixtures and Equipment [Member]    
Property and equipment 13,307 12,874
Leasehold Improvements [Member]    
Property and equipment 26,064 24,567
Construction in Progress [Member]    
Property and equipment $ 1,523 $ 1,259