Consolidated Condensed Statements of Comprehensive Income (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Statement Of Other Comprehensive Income [Abstract]
Net income	$ 1,616	$ 1,572	$ 3,061	$ 3,348
Other comprehensive income (loss), net of tax:
Change in unrealized gains on securities, net of taxes	42		40	27
Other comprehensive income (loss)	42		40	27
Comprehensive income	$ 1,658	$ 1,572	$ 3,101	$ 3,375