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Note 1 - Significant Accounting Policies (Tables)
 12 Months Ended
Apr. 29, 2017
Notes Tables  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
   
(In thousands)
  
   
Fiscal
2017
    
Fiscal
2016
    
Fiscal
2015
  
Balance at beginning of year
   $
484
     $
330
     $
399
  
Net charge to expense
    
74
      
232
      
117
  
Net charge-off
    
(90
 )    
(78
 )    
(186
 )
Balance at end of year
   $
468
     $
484
     $
330