Note 8 - Federal, State and Local Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Federal	$ 1,313	$ 990
State and local	353	296
Current tax expense	1,666	1,286
Federal	44	(16)
State and local	1	77
Deferred tax expense (benefit):	45	61
Income tax provision	$ 1,711	$ 1,347