Note 10 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Oct. 31, 2020
Income Tax Expense (Benefit), Total	$ 648,000	$ 3,000	$ 454,000	$ (11,000)
Effective Income Tax Rate Reconciliation, Percent, Total	24.20%	(1.40%)	21.80%	6.70%
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	$ 127,000		$ 127,000		$ 107,000
Unrecognized Tax Benefits, Ending Balance	$ 33,000		$ 33,000