Note 7 - Stock-based Compensation and Equity Transactions (Details Textual) - USD ($)									3 Months Ended		6 Months Ended
	Apr. 30, 2024	Apr. 16, 2024	Jan. 11, 2024	Nov. 01, 2023	Oct. 31, 2023	Aug. 29, 2023	Jan. 11, 2023	Jan. 11, 2021	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2024	Apr. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	7 years 10 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	5 years 7 months 28 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	7 years 10 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value	$ 49,760								$ 49,760		$ 49,760
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value	38,720								38,720		38,720
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	49,261								49,261		49,261
Selling, General and Administrative Expenses [Member]
Share-Based Payment Arrangement, Expense									248,000	$ 229,000	503,000	$ 441,000
Restricted Stock [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 852,384								$ 852,384		$ 852,384
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year
Incentive Stock Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross									0		0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value											$ 1.76	$ 3.21
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 1,005,945								$ 1,005,945		$ 1,005,945
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	3 years
Incentive Stock Options [Member] | Share-Based Payment Arrangement, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross						10,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period						10 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares (in shares)						2,500
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			110,099				54,092
One Manager and Three Officers [Member] | Incentive Stock Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross							108,181
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			4 years				4 years
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							25.00%
One Manager and Three Officers [Member] | Restricted Stock and Incentive Stock Options [Member] | Vesting On January 11, 2025 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage			25.00%
Another Manager [Member] | Incentive Stock Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross							50,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)					50,000
Another Manager [Member] | Restricted Stock and Incentive Stock Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period								10 years
One Officer [Member] | Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period				15,202
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period				1 year
One Officer [Member] | Restricted Stock [Member] | Vesting On January 31, 2024 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage				25.00%
Three Officers [Member] | Incentive Stock Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross		25,000	220,001
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period		4 years
Three Officers [Member] | Incentive Stock Options [Member] | Vesting on April 16, 2028 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		25.00%