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Product Warranties (Tables)
 6 Months Ended
Jan. 31, 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 January 31, 2014 and 2013 (in thousands):
 
 
 
2014
 
2013
 
 
 
 
 
 
 
 
 
Beginning balance
 
$
156
 
$
166
 
Warranty cost incurred
 
 
(57)
 
 
(54)
 
Accrued warranty cost
 
 
40
 
 
47
 
Ending balance
 
$
139
 
$
159