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Inventories
6 Months Ended
Oct. 31, 2011
Inventories [Abstract]  
Inventories

NOTE G--INVENTORIES

The components of inventories were:
   
October 31,
   
April 30,
 
(in thousands)
 
2011
   
2011
 
Raw materials
  $ 9,759     $ 9,275  
Work-in-process
    16,662       16,597  
Finished goods
    8,413       8,679  
                 
Total FIFO inventories
    34,834       34,551  
                 
Reserve to adjust inventories to LIFO value
    (10,086 )     (10,080 )
                 
Total LIFO inventories
  $ 24,748     $ 24,471  

Interim LIFO calculations are based on management's estimates of expected year-end inventory levels and costs. Since these items are estimated, interim results are subject to the final year-end LIFO inventory valuation.