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Consolidated Statements of Income and Comprehensive Income (Parenthetical) (USD $) In Thousands	12 Months Ended
	Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009
Consolidated Statements of Income and Comprehensive Income
Tax effect of unrealized holding gains (losses) arising during the year	$ 58	$ 188	$ (1,736)
Tax effect of reclassification adjustment for gains included in income	$ (133)	$ 811	$ 762

Tax effect on the reclassification adjustment for gains or losses realized upon the sale of securities during the period.

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.