Comprehensive Income - Components of comprehensive income that are included in Consolidated Statement of Changes in Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Oct. 31, 2013	Oct. 31, 2013	Oct. 31, 2012
Comprehensive Income (Loss) Note [Abstract]
Change in unrealized gains on securities, Before Tax		$ 61	$ 41
Change in unrealized gains on securities, Tax Expense		(21)	(14)
Change in unrealized gains on securities, Net of Tax		40	27
Other comprehensive income (loss), available-for-sale securities adjustment, Before Tax		61	41
Other comprehensive income (loss), available-for-sale securities, Tax Expense		(21)	(14)
Other comprehensive income (loss), available-for-sale securities adjustment, Net of Tax	$ 42	$ 40	$ 27