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Note 7 - Federal, State and Local Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2020	Apr. 30, 2020	Dec. 31, 2019	Apr. 30, 2019
Federal	$ 5,407		$ 4,201		$ 2,964
State and local	1,046		1,353		600
Current tax expense	6,453		5,554		3,564
Federal	859		(174)		(422)
State and local	(316)		328		1,162
Deferred tax expense (benefit):	543	$ 154	154	$ 740	740
Income tax provision	$ 6,996	$ 5,708	$ 5,708	$ 4,304	$ 4,304

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