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Note 2 - Property, Plant and Equipment (Tables)
12 Months Ended
Apr. 29, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
(In thousands)
 
   
2017
   
2016
 
Land
  $
9,500
    $
9,500
 
Buildings and improvements
   
51,157
     
50,856
 
Machinery and equipment
   
172,257
     
162,195
 
Total
   
232,914
     
222,551
 
Less accumulated depreciation
   
(167,764
)    
(160,619
)
Property, plant and equipment – net
  $
65,150
    $
61,932