Sales by Geographic Area (Detail) (USD $)	3 Months Ended		9 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Revenue, Major Customer [Line Items]
Sales revenue	$ 7,472,413	$ 4,947,753	$ 19,703,354	$ 13,479,610
United States
Revenue, Major Customer [Line Items]
Sales revenue	7,064,430	4,594,086	18,592,094	12,300,852
Canada
Revenue, Major Customer [Line Items]
Sales revenue	172,693	124,030	476,351	543,131
Israel
Revenue, Major Customer [Line Items]
Sales revenue	120,131	59,504	237,090	173,295
Mexico
Revenue, Major Customer [Line Items]
Sales revenue	88,607	96,874	322,623	304,453
Foreign countries, All Other
Revenue, Major Customer [Line Items]
Sales revenue	$ 26,552	$ 73,259	$ 75,196	$ 157,879