Note 7 - Leases (Details Textual)	3 Months Ended		6 Months Ended
	Apr. 30, 2021 USD ($) ft²	Apr. 30, 2020 USD ($)	Apr. 30, 2021 USD ($) ft²	Apr. 30, 2020 USD ($)	Oct. 31, 2020 USD ($)
Operating Lease, Expense	$ 100,203	$ 98,558	$ 200,568	$ 194,429
Operating Lease, Weighted Average Remaining Lease Term (Month)	40 months 21 days		40 months 21 days
Operating Lease, Weighted Average Discount Rate, Percent	5.00%		5.00%
Operating Lease, Payments	$ 97,674	$ 95,251	$ 194,974	189,450
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	1,204,711		1,204,711		$ 1,265,194
Accounts Payable and Accrued Liabilities [Member]
Operating Lease, Liability, Current	370,951		370,951		332,329
Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Noncurrent	$ 926,034		$ 926,034		$ 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