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Note 8 - Stock-based Compensation (Tables)
12 Months Ended
Apr. 28, 2018
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Number
of Shares
   
 
Price
(a)
 
Options outstanding, beginning of year
   
383,595
    $
11.47
 
Granted
   
500
     
29.61
 
Exercised
   
(34,650
)    
16.15
 
Cancelled
   
(4,500
)    
17.59
 
Options outstanding, end of year
   
344,945
     
10.84
 
Options exercisable, end of year
   
209,579
     
8.49