Note 7 - Leases (Details Textual)	3 Months Ended
	Jan. 31, 2020 USD ($) ft²	Feb. 06, 2020	Apr. 30, 2015 ft²
Operating Lease, Expense	$ 95,871
Operating Lease, Weighted Average Remaining Lease Term	55 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	5.00%
Operating Lease, Payments	$ 94,199
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	1,088,719
Other Assets [Member]
Operating Lease, Right-of-Use Asset	1,142,054
Accounts Payable and Accrued Liabilities [Member]
Operating Lease, Liability, Current	239,536
Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Noncurrent	$ 904,722
Operating Lease for Office, Manufacturing and Warehouse Space in Plano, Texas [Member]
Area of Real Estate Property | ft²	34,000
Operating Lease for Warehouse Space in Roanoke, Virginia [Member]
Area of Real Estate Property | ft²			36,000
Lessee, Operating Lease, Term of Contract			12 months
Lease Term, Extension, Term	1 year
Operating Lease for Warehouse Space in Roanoke, Virginia [Member] | Subsequent Event [Member]
Lessee, Operating Lease, Renewal Term		36 months
Operating Lease For Office Equipment [Member]
Lessee, Operating Lease, Term of Contract	60 months