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Related Party Transactions (Tables) | 6 Months Ended
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Oct. 31, 2012
Related Party Transactions [Abstract] |
Schedule of non voting revenues interest and non voting profits interests |
|  | Three Months Ended October 31, |  |  | Six Months Ended October 31, |
($ in thousands) |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Non-voting revenues interest in EAM |  | $ | 1,414 |  |  | $ | 1,330 |  |  | $ | 2,808 |  |  | $ | 2,821 |
Non-voting profits interest in EAM |  |  | 115 |  |  |  | 13 |  |  |  | 194 |  |  |  | 94 |
|  | $ | 1,529 |  |  | $ | 1,343 |  |  | $ | 3,002 |  |  | $ | 2,915 |

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- Definition Schedule of non voting revenues interest and non voting profits interests. + References No definition available. + Details
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