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Related Party Transactions (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2012 | Oct. 31, 2011 | Oct. 31, 2012 | Oct. 31, 2011
Schedule of Equity Method Investments [Line Items] |  |  |  |
Non-voting revenues interest in EAM |  |  | $ 2,808 | $ 2,821
Non-voting profits interest in EAM |  |  | 194 | 94
Revenues and profits interests in EAM Trust | 1,529 | 1,343 | 3,002 | 2,915
EAM Trust |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Non-voting revenues interest in EAM | 1,414 | 1,330 | 2,808 | 2,821
Non-voting profits interest in EAM | 115 | 13 | 194 | 94
Revenues and profits interests in EAM Trust | $ 1,529 | $ 1,343 | $ 3,002 | $ 2,915

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