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Stock-based compensation and equity transactions - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Apr. 07, 2016
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2016
Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average remaining life of options outstanding       5 years 1 month 2 days  
Weighted average remaining contractual life of options exercisable       3 years 4 months 24 days  
Weighted average life of options vested and expected to vest       5 years 1 month 2 days  
Aggregate intrinsic value of options outstanding   $ 200,000   $ 200,000  
Aggregate intrinsic value of options exercisable   200,000   200,000  
Aggregate intrinsic value of options vested and expected to vest   200,000   200,000  
Non-vested stock-based arrangements yet to be recognized   602,000   $ 602,000  
Stock based arrangements yet to be recognized, weighted average period expected to be recognized       5 years 2 months 12 days  
Stock Issued During Period, Value, Stock Options Exercised         $ 1,060,000
Non-employee director annual grant   $ 30,000   $ 30,000  
Options granted for each non-employee director       51,192  
Value of stock option issued       $ 15,000  
Fair value of stock option   $ 0.87   $ 0.87  
Stock based compensation expense   $ 51,000 $ 51,000 $ 102,000 $ 101,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 0.63 $ 1.00
Proceeds from Issuance of Common Stock         $ 252,381
Chief Operating Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, options, grants in period, gross 33,744        
Stock Issued During Period, Value, Share-based Compensation, Gross       $ 8,750  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price   $ 0.26   $ 0.26  
Employee | Incentive stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation arrangement by share-based payment award, options, grants in period, gross         127,558
Cost of Sales          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock based compensation expense       $ 17,000 $ 29,000
Selling, General and Administrative Expenses          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock based compensation expense       $ 85,000 $ 72,000