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Note 7 - Leases (Details Textual)	3 Months Ended
	Jan. 31, 2021 USD ($) ft²	Jan. 31, 2020 USD ($)	Oct. 31, 2020 USD ($)
Operating Lease, Expense	$ 100,348	$ 95,871
Operating Lease, Weighted Average Remaining Lease Term (Month)	41 months 15 days
Operating Lease, Weighted Average Discount Rate, Percent	5.10%
Operating Lease, Payments	$ 97,300	94,199
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	0	$ 1,088,719
Other Assets [Member]
Operating Lease, Right-of-Use Asset	1,180,674		$ 1,265,194
Accounts Payable and Accrued Liabilities [Member]
Operating Lease, Liability, Current	337,331		332,329
Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Noncurrent	$ 860,196		$ 946,653
Operating Lease for Office, Manufacturing and Warehouse Space in Plano, Texas [Member]
Area of Real Estate Property (Square Foot) | ft²	34,000
Operating Lease for Warehouse Space in Roanoke, Virginia [Member]
Area of Real Estate Property (Square Foot) | ft²	36,000
Operating Lease For Office Equipment [Member]
Lessee, Operating Lease, Term of Contract (Month)	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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