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Consolidated Condensed Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015
Statement Of Other Comprehensive Income [Abstract] |  |  |  |
Net income | $ 1,913 | $ 2,177 | $ 6,024 | $ 6,195
Other comprehensive income (loss), net of tax: |  |  |  |
Change in unrealized gains on securities, net of taxes | (127) | (16) | (153) | (33)
Other comprehensive income (loss) | (127) | (16) | (153) | (33)
Comprehensive income | $ 1,786 | $ 2,161 | $ 5,871 | $ 6,162

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