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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
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Consolidated Statements of Cash Flows [Abstract] |  |  |  |
Cash and cash equivalents | $ 5,892 | $ 5,716 | $ 5,536 | $ 571

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