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Warranty Reserves (Tables)
 3 Months Ended
Jul. 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 three months ended July 31, 2013 is as follows:

(Amounts in thousands)
    
Balance at May 1, 2013
 
$
139
 
Additional reserves
   
180
 
Warranty reserve expense adjustments
   
(9
)
Charges incurred
   
(54
)
Balance at July 31, 2013
 
$
256