Comprehensive Income - Components of comprehensive income that are included in the Consolidated Statement of Changes in Shareholders' Equity (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Comprehensive Income (Loss) Note [Abstract]
Change in unrealized gains (losses) on securities during the period, before tax	$ 28	$ 256	$ 24
Change in unrealized gains (losses) on securities during the period, tax (expense)/(benefit)	(10)	(90)	(9)
Change in unrealized gains (losses) on securities during the period, net of tax	18	166	15
Add /Less:: Gains losses realized in net income, before tax	(36)		11
Add/Less: Gains losses realized in net income, tax (expense)/(benefit)	13		(4)
Add/Less: Gains realized in net income amount, net of tax	(23)		7
Other comprehensive income (loss), available-for-sale securities adjustment, before tax	(8)	256	35
Other comprehensive income (loss), available-for-sale securities, tax (expense)/(benefit)	3	(90)	(13)
Other comprehensive income (loss), available-for-sale securities adjustment, net of tax	$ (5)	$ 166	$ 22