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Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2012 | Oct. 31, 2011 | Oct. 31, 2012 | Oct. 31, 2011
Comprehensive Income (Loss) Note [Abstract] |  |  |  |
Change in unrealized gains on securities during the period, before tax |  |  | $ 41 | $ (50)
Change in unrealized gains on securities during the period, tax expense |  |  | (26) |
Change in unrealized gains on securities during the period, tax benefit |  |  | 12 | 18
Change in unrealized gains on securities during the period, net of tax |  |  | 27 | (32)
Add: Losses realized in net income, before tax |  |  |  | 5
Add: Losses realized in net income, tax expense |  |  |  | (2)
Add: Losses realized in net income, tax benefit |  |  |  |
Add: Losses realized in net income, net of tax |  |  |  | 3
Other comprehensive income (loss), available-for-sale securities adjustment, before tax |  |  | 41 | (45)
Other comprehensive income (loss), available-for-sale securities, tax expense |  |  | (26) | (2)
Other comprehensive income (loss), available-for-sale securities, tax benefit |  |  | 12 | 18
Other comprehensive income (loss), available-for-sale securities adjustment, net of tax |  | $ 20 | $ 27 | $ (29)

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