Note 8 - Federal, State and Local Income Taxes - Effective Income Tax Rate Reconciliation (Details)	9 Months Ended		12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	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	4.85%	3.04%
Effect of dividends received deductions	(0.25%)	(0.24%)
Other, net	0.00%	0.00%
Effective income tax rate	25.60%	23.80%