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Note 7 - Leases (Details Textual)	3 Months Ended		9 Months Ended
	Jul. 31, 2021 USD ($) ft²	Jul. 31, 2020 USD ($)	Jul. 31, 2021 USD ($) ft²	Jul. 31, 2020 USD ($)	Oct. 31, 2020 USD ($)
Operating Lease, Expense	$ 103,333	$ 99,327	$ 303,902	$ 293,756
Operating Lease, Weighted Average Remaining Lease Term (Year)	37 years 10 months 24 days		37 years 10 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	5.00%		5.00%
Operating Lease, Payments	$ 106,182	$ 96,681	$ 301,156	286,131
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability			208,390	$ 1,462,817
Other Assets [Member]
Operating Lease, Right-of-Use Asset	1,117,247		1,117,247		$ 1,265,194
Accounts Payable and Accrued Liabilities [Member]
Operating Lease, Liability, Current	378,161		378,161		332,329
Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Noncurrent	$ 828,512		$ 828,512		$ 946,653
Operating Lease for Office, Manufacturing and Warehouse Space in Plano, Texas [Member]
Area of Real Estate Property (Square Foot) | ft²	34,000		34,000
Operating Lease for Warehouse Space in Roanoke, Virginia [Member]
Area of Real Estate Property (Square Foot) | ft²	36,000		36,000
Operating Lease For Office Equipment [Member]
Lessee, Operating Lease, Term of Contract (Month)	60 months		60 months

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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