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Note 9 - Pension Plans (Tables)
12 Months Ended
Apr. 28, 2018
Notes Tables  
Schedule of Multiemployer Plans [Table Text Block]
   
(In thousands)
 
   
Fiscal
   
Fiscal
   
Fiscal
 
Pension Fund
 
2018
   
2017
   
2016
 
CSSS Fund
  $
1,370
    $
1,262
    $
1,172
 
WCT Fund    
619
     
477
     
485
 
Other multi-employer pension funds
   
228
     
201
     
448
 
Total
  $
2,217
    $
1,940
    $
2,105