Note 6 - Earnings (Loss) Per Share - Computation of Basic and Diluted Weighted Average Shares Outstanding (Details) - shares	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Basic (in shares)	9,963,291	9,704,880	9,927,776	9,633,935
Add effects of potentially dilutive securities-assumed exercise of stock options (in shares)	166,181	0	169,140	0
Weighted average shares outstanding for diluted earnings (loss) per share (in shares)	10,129,472	9,704,880	10,096,916	9,633,935