Note 8 - Stock-based Compensation and Equity Transactions (Details Textual) - USD ($)					3 Months Ended		6 Months Ended
	Jan. 10, 2023	May 02, 2022	Jan. 10, 2022	Jan. 12, 2021	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2023	Apr. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term							6 years 8 months 4 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term							5 years 7 months 24 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term							6 years 8 months 8 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value					$ 124,280		$ 124,280
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value					80,120		80,120
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value					122,285		122,285
Share-Based Payment Arrangement, Expense							687,000	$ 498,000
Selling, General and Administrative Expenses [Member]
Share-Based Payment Arrangement, Expense					246,000	$ 191,000
Restricted Stock [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount					528,229		$ 528,229
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition							1 year 3 months 18 days
Incentive Stock Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value							$ 3.21	$ 3.77
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount					$ 866,591		$ 866,591
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition							2 years 8 months 26 days
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)	54,092		39,666
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		4 years
One Manager and Three Officers [Member] | Restricted Stock and Incentive Stock Options [Member] | Vesting on January 10, 2023 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage			1.00%
One Manager and Three Officers [Member] | Restricted Stock and Incentive Stock Options [Member] | Vesting on January 10, 2024 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	1.00%
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)	108,181
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)			10 years
Incentive Stock Options [Member] | One Manager and Three Officers [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)			106,001
Another Manager [Member] | Restricted Stock and Incentive Stock Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)				10 years
Another Manager [Member] | Incentive Stock Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	50,000