Note 1 - Business Activities and Summary of Significant Accounting Policies - Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Consolidated net income (A)	$ (81)	$ 3,521
Weighted average shares outstanding for basic earnings per share (B) (in shares)	9,678,822	9,358,836
Add effects of potentially dilutive securities - assumed exercise of stock options (in shares)		495,768
Weighted average shares outstanding for diluted earnings per share (C) (in shares)	9,678,822	9,854,604
Basic earnings per share (A)/(B) (in dollars per share)	$ (0.01)	$ 0.38
Diluted earnings per share (A)/(C) (in dollars per share)	$ (0.01)	$ 0.36