Consolidated Condensed Statements of Comprehensive Income (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Statement Of Other Comprehensive Income [Abstract]
Net income	$ 1,445	$ 1,776
Other comprehensive income (loss), net of tax:
Change in unrealized gains on securities, net of taxes	(3)	27
Other comprehensive income (loss)	(3)	27
Comprehensive income	$ 1,442	$ 1,803