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Note 2 - Property, Plant and Equipment (Tables)
3 Months Ended
Jul. 28, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
(In thousands)
 
   
July 28,
2018
   
April 28,
2018
 
Land
  $
9,500
    $
9,500
 
Buildings and improvements
   
56,957
     
56,947
 
Machinery and equipment
   
200,248
     
194,241
 
Total
   
266,705
     
260,688
 
Less accumulated depreciation
   
(178,097
)    
(174,881
)
Property, plant and equipment – net
  $
88,608
    $
85,807