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Note 7 - Stock-based Compensation and Equity Transactions (Details Textual) - USD ($)												3 Months Ended		9 Months Ended
	Jul. 16, 2021	Jun. 15, 2021	Mar. 04, 2021	Jan. 12, 2021	Dec. 31, 2020	Sep. 15, 2020	Jul. 31, 2020	Jun. 30, 2020	Jan. 09, 2020	Dec. 06, 2019	Nov. 04, 2019	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)														6 years 5 months 23 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term (Year)														5 years 7 months 2 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term (Year)														6 years 5 months 23 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value												$ 2,729,000		$ 2,729,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value												1,221,000		1,221,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value												2,713,000		2,713,000
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense												374,000	$ 166,000	634,000	$ 449,000
Share-based Payment Arrangement, Nonemployee [Member]
Nonemployee Director, Annual Compensation												$ 50,000		$ 50,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Per Director (in shares)											3,270			5,757
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Value											$ 25,000			$ 25,000
Share Price, 20 Day Average (in dollars per share)											$ 6.36	$ 4.34		$ 4.34
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)														$ 3.38	$ 3.06
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total												$ 587,000		$ 587,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)														2 years 10 months 9 days
Restricted Stock [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total												311,000		$ 311,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)														1 year 4 months 13 days
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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in shares)								2,500		10,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Number to Vest Each Year (in shares)								2,500		10,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)								3 years		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)								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
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
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
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)									10 years
Five Employees [Member] \| Restricted Stock [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, Equity Instruments Other than Options, Grants in Period (in shares)									38,500
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%
Five Employees [Member] \| Restricted Stock and Incentive Stock Options [Member] \| Vesting Quarterly After January 9, 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)									3 years
One Manager and Three Officers [Member] \| Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)				67,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)				10 years
One Manager and Three Officers [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				33,500
One Manager and Three Officers [Member] \| Restricted Stock and Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				4 years
One Manager and Three Officers [Member] \| Restricted Stock and Incentive Stock Options [Member] \| Vesting on January 12, 2022 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				25.00%
One Manager and Three Officers [Member] \| Restricted Stock and Incentive Stock Options [Member] \| Vesting Quarterly After January 12, 2022 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)				3 years
Chief Executive Officer [Member] \| Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)	50,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
New Director [Member] \| 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, Per Director (in shares)					3,334
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)					$ 5.31
Share-based Compensation Arrangement by Share-based Payment Award, Nonemployee Service Period upon Joining the Board (Month)					8 months 15 days
Non-employee Directors and Chairperson of Committee on Board [Member]
Share Price, 20 Day Average (in dollars per share)						$ 4.34
Annual Payable, Cash, Additional Compensation												$ 15,000		$ 15,000
Stock Issued During Period, Shares, Per Person, Issued For Services (in shares)						3,454	279
Shares Issued, Price Per Share (in dollars per share)							$ 4.47						$ 4.47		$ 4.47
Annual Payable, Shares, Additional Compensation						$ 15,000
Director [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Value		$ 15,000	$ 15,000
Share Price, 20 Day Average (in dollars per share)		$ 7.56	$ 6.04
Share-based Compensation Arrangement by Share-based Payment Award, Nonemployee Service Period upon Joining the Board (Month)		3 months	6 months 15 days
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)		496	1,344