Note 3 - Allowance for Doubtful Accounts for Trade Accounts Receivable (Tables)

3 Months Ended

Jan. 31, 2020

Notes Tables

Summary of Changes in the Allowance for Doubtful Accounts for Trade Accounts Receivable [Table Text Block]

	Three Months Ended
	January 31,
	2020			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