Note 8 - Federal, State and Local Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Federal	$ 1,662	$ 1,525			$ 4,684	$ 4,189
State and local	472	108			1,066	805
Current tax expense	2,134	1,633			5,750	4,994
Federal	(175)	438			(57)	468
State and local	(46)	(304)			(389)	(308)
Deferred tax expense (benefit):	(221)	134	$ (446)	$ 160	(446)	160
Income tax provision	$ 1,913	$ 1,767			$ 5,304	$ 5,154