Note 8 - Federal, State and Local Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Federal	$ 1,195	$ 1,191	$ 3,657	$ 3,581
State and local	469	364	979	831
Current tax expense	1,664	1,555	4,636	4,412
Federal	288	184	(18)	85
State and local	(107)	(68)	(171)	(28)
Deferred tax expense (benefit):	181	116	(189)	57
Income tax provision	$ 1,845	$ 1,671	$ 4,447	$ 4,469