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Related Party Transactions (Tables) | 9 Months Ended
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Jan. 31, 2014
Related Party Transactions [Abstract] |
Schedule of non voting revenues interest and non voting profits interests |
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
($ in thousands) |  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Non-voting revenues interest in EAM |  | $ | 1,767 |  |  | $ | 1,472 |  |  | $ | 5,028 |  |  | $ | 4,280 |
Non-voting profits interest in EAM |  |  | 207 |  |  |  | 153 |  |  |  | 569 |  |  |  | 347 |
|  | $ | 1,974 |  |  | $ | 1,625 |  |  | $ | 5,597 |  |  | $ | 4,627 |

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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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