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
	Jul. 31, 2014	Jul. 31, 2013
Comprehensive Income (Loss) Note [Abstract]
Change in unrealized gains on securities, Before Tax	$ (131)	$ (4)
Change in unrealized gains on securities, Tax Benefit	46	1
Change in unrealized gains on securities, Net of Tax	(85)	(3)
Other comprehensive income (loss), available-for-sale securities adjustment, Before Tax	(131)	(4)
Other comprehensive income (loss), available-for-sale securities, Tax Benefit	46	1
Other comprehensive income (loss), available-for-sale securities adjustment, Net of Tax	$ (85)	$ (3)