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Note 7 - Stock-based Compensation and Equity Transactions (Details Textual) - USD ($)								3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jun. 30, 2020	Jan. 09, 2020	Dec. 06, 2019	Nov. 04, 2019	Mar. 08, 2019	Dec. 03, 2018	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Aug. 01, 2020	Nov. 01, 2019	Oct. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)										4 years 357 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)										2 years 306 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year)										4 years 354 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 719,000							$ 719,000		$ 719,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	433,000							433,000		433,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	714,000							714,000		714,000
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense								166,000	$ 68,000	$ 449,000	$ 260,000
Share-based Payment Arrangement, Nonemployee [Member]
Nonemployee Director, Annual Compensation													$ 50,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Value					$ 25,000
Share Price, 20 Day Average (in dollars per share)					$ 6.36
Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)										$ 3.06	$ 3.98
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	619,000							619,000		$ 619,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)										4 years 113 days
Restricted Stock [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 255,000							$ 255,000		$ 255,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)										1 year 98 days
Restricted Stock [Member] \| Share-based Payment Arrangement, Nonemployee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					3,270
Two Employees [Member] \| Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)			3,241				25,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares)			3,241				5,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number to Vest Each Year (in shares)							5,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)							4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)							10 years
One Employee [Member] \| Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)		10,000		50,000		25,000	10,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares)		2,500		10,000		5,000	2,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number to Vest Each Year (in shares)		2,500		10,000		5,000	2,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years		4 years		4 years	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		10 years		10 years		10 years	10 years
Three Employees [Member]
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares)			12,075
Share-based Payment Arrangement, Expense			$ 77,000
Five Employees [Member] \| Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)			77,000
Five Employees [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			38,500
Five Employees [Member] \| Restricted Stock and Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)			10 years
Five Employees [Member] \| Restricted Stock and Incentive Stock Options [Member] \| Vesting on January 9, 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%
Non-employee Directors and Chairperson of Committee on Board [Member]
Annual Payable, Cash, Additional Compensation														$ 15,000
Stock Issued During Period, Shares, Per Person, Issued For Services (in shares)	279
Shares Issued, Price Per Share (in dollars per share)	$ 4.47							$ 4.47		$ 4.47
Non-employee Directors and Chairperson of Committee on Board [Member] \| Subsequent Event [Member]
Annual Payable, Shares, Additional Compensation												$ 15,000