Concentration of credit risk and sales to major customers - Additional Information (Detail) (USD $)	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Concentration Of Credit Risk and Sales To Major Customers [Line Items]
Cash, FDIC Insured Amount	750,000
Optiflex Customer Concentration Risk
Concentration Of Credit Risk and Sales To Major Customers [Line Items]
Concentration Risk, Percentage	18.00%
Sales Revenue, Goods, Net	5,569,070
Sales Revenue, Goods, Net
Concentration Of Credit Risk and Sales To Major Customers [Line Items]
Concentration Risk, Percentage	33.00%	17.00%
Accounts Receivable
Concentration Of Credit Risk and Sales To Major Customers [Line Items]
Concentration Risk, Percentage	49.00%	14.00%