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Warranty Reserves (Tables)
 9 Months Ended
Jan. 31, 2013
Warranty Reserves [Abstract]  
Product warranty reserve activity
Estimated warranty costs are accrued as revenues are recognized.  Included in the warranty cost accruals are costs for basic warranties on products sold.  A summary of product warranty reserve activity for the nine months ended January 31, 2013 is as follows:

(Amounts in thousands)
    
Balance at May 1, 2012
 
$
169
 
Additional reserves
   
120
 
Warranty reserve expense adjustments
   
(45
)
Charges incurred
   
(137
)
Balance at January 31, 2013
 
$
107