Note 8 - Schedule of Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2016	Jul. 31, 2015
Current tax expense:
Federal	$ 3,577	$ 1,024
State and local	325	72
Current tax expense	3,902	1,096
Deferred tax expense (benefit):
Federal	(189)	(12)
State and local	15	(151)
Deferred tax expense (benefit):	(174)	(163)
Income tax provision	$ 3,728	$ 933