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Organization and Summary of Significant Accounting Policies (Detail Textuals) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jan. 31, 2016 | Apr. 30, 2015
Schedule of Equity Method Investments [Line Items] |  |
Cash equivalents | $ 9,641 | $ 5,272
EAM Trust |  |
Schedule of Equity Method Investments [Line Items] |  |
Non-voting profits interest ("Profits Interest") | 50.00% |
Percentage of revenue | 100.00% |
Minimum percentage of non voting profits interests due each quarter from EAM | 90.00% |
EAM Trust | Minimum |  |
Schedule of Equity Method Investments [Line Items] |  |
Percentage of non-voting revenues interest based on adjusted gross revenues | 41.00% |
EAM Trust | Maximum |  |
Schedule of Equity Method Investments [Line Items] |  |
Percentage of non-voting revenues interest based on adjusted gross revenues | 55.00% |

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