Note 8 - Federal, State and Local Income Taxes - Effective Income Tax Rate Reconciliation (Details)	6 Months Ended		12 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Apr. 30, 2019
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	3.03%	3.37%
Effect of dividends received deductions	(0.25%)	(0.23%)
Other, net	(0.02%)	0.01%
Effective income tax rate	23.76%	24.15%