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Related Party Transactions (Tables) | 9 Months Ended
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Jan. 31, 2013
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) |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Non-voting revenues interest in EAM |  | $ | 1,472 |  |  | $ | 1,430 |  |  | $ | 4,280 |  |  | $ | 4,251 |
Non-voting profits interest in EAM |  |  | 153 |  |  |  | 26 |  |  |  | 347 |  |  |  | 120 |
|  | $ | 1,625 |  |  | $ | 1,456 |  |  | $ | 4,627 |  |  | $ | 4,371 |

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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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