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Note 5 - Selected Financial Statement Data - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
May 01, 2021
May 02, 2020
Property and equipment, gross $ 233,387 $ 251,440
Less accumulated depreciation 174,705 183,956
Property, Plant and Equipment, Net, Ending Balance 58,682 67,484
Land [Member]    
Property and equipment, gross 1,924 2,183
Building [Member]    
Property and equipment, gross 69,608 68,804
Machinery and Equipment [Member]    
Property and equipment, gross 98,451 104,157
Office Furniture and Equipment [Member]    
Property and equipment, gross 4,103 6,151
Computer Software and Hardware [Member]    
Property and equipment, gross 44,851 53,441
Equipment Held For Rental [Member]    
Property and equipment, gross 0 287
Demonstration Equipment [Member]    
Property and equipment, gross 7,186 8,473
Transportation Equipment [Member]    
Property and equipment, gross $ 7,264 $ 7,944