Note 8 - Federal, State and Local Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Federal	$ 1,253	$ 1,252	$ 2,462	$ 2,390
State and local	259	110	510	467
Current tax expense	1,512	1,362	2,972	2,857
Federal	(346)	(11)	(306)	(99)
State and local	(64)	40	(64)	40
Deferred tax expense (benefit):	(410)	29	(370)	(59)
Income tax provision	$ 1,102	$ 1,391	$ 2,602	$ 2,798