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Note 7 - Federal, State and Local Income Taxes - Schedule of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Current tax expense (benefit):
Federal	$ 6,360	$ 3,799	$ 3,197
State and local	469	219	243
	6,829	4,018	3,440
Deferred tax expense (benefit):
Federal	(1,299)	(839)	(83)
State and local	(412)	(462)	(154)
	(1,711)	(1,301)	(237)
Income tax provision:	$ 5,118	$ 2,717	$ 3,203

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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