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Note 9 - Pension Plans (Tables)
12 Months Ended
Apr. 30, 2016
Notes Tables  
Schedule of Multiemployer Plans [Table Text Block]
   
(In thousands)
 
   
Fiscal
   
Fiscal
   
Fiscal
 
Pension Fund
 
2016
   
2015
   
2014
 
CSSS Fund
  $ 1,172     $ 1,103     $ 1,079  
WCT Fund     485       637       476  
Other multi-employer pension funds
    448       306       295  
Total
  $ 2,105     $ 2,046     $ 1,850