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Note 2 - Property, Plant and Equipment (Tables)
6 Months Ended
Oct. 28, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
(In thousands)
 
   
October 28,
2017
   
April 29,
2017
 
Land
  $
9,500
    $
9,500
 
Buildings and improvements
   
51,323
     
51,157
 
Machinery and equipment
   
181,073
     
172,257
 
Total
   
241,896
     
232,914
 
Less accumulated depreciation
   
(172,537
)    
(167,764
)
Property
, plant and equipment – net
  $
69,359
    $
65,150