Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable - Summary of Changes in the Allowance for Doubtful Accounts for Trade Accounts Receivable (Details) - USD ($)	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Balance at beginning of period	$ 99,562	$ 64,242
Bad debt expense (recovery)	(14,838)	23,809
Balance at end of period	$ 84,724	$ 88,051