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Product Warranties (Narrative) (Details) (USD $)
3 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Oct. 31, 2012
Oct. 31, 2011
Product Warranties [Abstract]        
Accrual for estimated product warranty claims $ 210,000 $ 158,000 $ 250,000 $ 175,000
Warranty claims recovery 9,656      
Warranty claims expense   $ 17,732