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Organization and Summary of Significant Accounting Policies (Detail Textuals) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 30, 2015 | Apr. 30, 2014
Schedule of Equity Method Investments [Line Items] |  |
Cash equivalents | $ 5,272 | $ 5,482
EAM Trust |  |
Schedule of Equity Method Investments [Line Items] |  |
Non-voting profits interest ("Profits Interest") | 50.00% |
EAM Trust | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment management fee revenues from its mutual fund and separate accounts business | 41.00% |
Percentage of non voting profits interests due each quarter from EAM | 90.00% |
EAM Trust | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment management fee revenues from its mutual fund and separate accounts business | 55.00% |

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