Note 8 - Federal, State and Local Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Federal	$ 1,391	$ 1,195	$ 4,013	$ 3,657
State and local	273	469	939	979
Current tax expense	1,664	1,664	4,952	4,636
Federal	311	288	797	(18)
State and local	(2)	(107)	9	(171)
Deferred tax expense (benefit):	309	181	806	(189)
Income tax provision	$ 1,973	$ 1,845	$ 5,758	$ 4,447