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Product Warranties (Tables)
9 Months Ended
Apr. 30, 2013
Product Warranties Disclosures [Abstract]  
Product Warrant Liability
The following table summarizes the activity related to the product warranty liability during the nine months ended April 30, 2013 and 2012 (in thousands):

 

    2013     2012  
             
Beginning balance   $ 166     $ 185  
Warranty cost incurred     (81 )     (92 )
Accrued warranty cost     68       78  
Ending balance   $ 153     $ 171