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Note 9 - Stock-based Compensation (Tables)
 12 Months Ended
Apr. 27, 2019
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
Number
of Shares
    
 
Price
(a)
  
Options outstanding, beginning of year
    
344,945
      
$10.84
  
Granted
    
9,000
      
40.03
  
Exercised
    
(27,300
 )    
16.70
  
Cancelled
    
(4,200
 )    
14.17
  
Options outstanding, end of year
    
322,445
      
11.14
  
Options exercisable, end of year
    
230,259
      
9.16