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Note D - Property and Equipment - Property and Equipment (Details) - USD ($)
$ in Thousands
Jan. 31, 2020
Apr. 30, 2019
Less accumulated depreciation and amortization $ (34,341) $ (31,585)
Property and equipment, net 28,820 28,537
Land [Member]    
Property and equipment 7,799 7,413
Building and Building Improvements [Member]    
Property and equipment 12,535 11,815
Furniture, Fixtures and Equipment [Member]    
Property and equipment 13,977 13,307
Leasehold Improvements [Member]    
Property and equipment 27,352 26,064
Construction in Progress [Member]    
Property and equipment $ 1,498 $ 1,523