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Note 2 - Property, Plant and Equipment (Tables)
12 Months Ended
Apr. 28, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
(In thousands)
 
   
2018
   
2017
 
Land
  $
9,500
    $
9,500
 
Buildings and improvements
   
56,947
     
51,157
 
Machinery and equipment
   
194,241
     
172,257
 
Total
   
260,688
     
232,914
 
Less accumulated depreciation
   
(174,881
)    
(167,764
)
Property, plant and equipment – net
  $
85,807
    $
65,150