Note 8 - Federal, State and Local Income Taxes - Effective Income Tax Rate Reconciliation (Details)	9 Months Ended		12 Months Ended
	Jan. 31, 2023	Jan. 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	3.39%	2.11%
Non-taxable SBA loan forgiveness	0.00%	(1.93%)
Effect of dividends received deductions	(0.25%)	(0.26%)
Other, net	0.01%	0.02%
Effective income tax rate	24.15%	20.94%