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Product Warranties (Tables)
 9 Months Ended
Apr. 30, 2014
Product Warranties Disclosures [Abstract]  
Product warranty liability
The following table summarizes the activity related to the product warranty liability during the six months ended April 30, 2014 and 2013 (in thousands):
 
 
 
2014
 
2013
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
156
 
$
166
 
Warranty cost incurred
 
 
(69)
 
 
(81)
 
Accrued warranty cost
 
 
48
 
 
68
 
Ending balance
 
$
135
 
$
153