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Stock-based compensation and equity transactions - Additional Information (Detail) - USD ($)						3 Months Ended
	Jan. 31, 2020	Jan. 09, 2020	Dec. 06, 2019	Mar. 08, 2019	Dec. 03, 2018	Jan. 31, 2020	Jan. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining life of options outstanding						5 years 8 months 23 days
Weighted average remaining contractual life of options exercisable						3 years 8 months 19 days
Weighted average life of options vested and expected to vest						5 years 8 months 19 days
Aggregate intrinsic value of options outstanding	$ 1,474,000					$ 1,474,000
Aggregate intrinsic value of options exercisable	886,000					886,000
Aggregate intrinsic value of options vested and expected to vest	$ 1,464,000					1,464,000
Stock based arrangements yet to be recognized, weighted average period expected to be recognized	4 years 7 months 21 days
Stock based compensation expense						187,000	$ 114,000
Selling And General Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense						$ 187,000	$ 114,000
Nonqualified Plan [Member] \| Share-based Payment Arrangement, Nonemployee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						3,270
Non-employee director annual grant	$ 50,000					$ 50,000
Fair value of stock price per share	$ 6.36					$ 6.36
Share based goods and non employee services transaction value of stock issued						$ 25,000
Three employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		$ 77,000
Three employees \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		12,075
Incentive stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock-based arrangements yet to be recognized	$ 765,000					$ 765,000
Incentive stock options \| Share-based Payment Arrangement, Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted						0	0
Fair value of stock price per share	$ 3.13					$ 3.13	$ 4.14
Incentive stock options \| One Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			50,000	25,000	10,000
Vested shares			10,000	5,000	2,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number			10,000	5,000	2,000
Expiration period			10 years	10 years	10 years
Incentive stock options \| Two employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted					25,000
Vested shares		3,241			5,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number					5,000
Expiration period					10 years
Incentive stock options \| Five employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested shares		77,000
Expiration period		10 years
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock-based arrangements yet to be recognized	$ 313,000					$ 313,000
Stock based arrangements yet to be recognized, weighted average period expected to be recognized	1 year 6 months
Restricted stock \| Five employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested shares		38,500
Restricted stock \| Five employees \| Vest on January 9, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights		25.00%
Restricted stock \| Five employees \| Over the next three years, commencing January 9, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years