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Note 8 - Stock-based Compensation (Tables)
 12 Months Ended
Apr. 29, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Number of
Shares
    
Price
(a)
  
Options outstanding, beginning of year
    
418,895
    $
12.44
  
Granted
    
-
      
-
  
Exercised
    
(27,400
 )    
13.31
  
Cancelled
   
(7,900
 )    
16.01
  
Options outstanding, end of year
    
383,595
      
11.47
  
Options exercisable, end of year
    
215,803
      
9.64