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Note 7 - Related Party Transactions (Tables) | 9 Months Ended
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Jan. 31, 2018
Notes Tables |
Schedule of Non Voting Revenues Interest and Non Voting Profits Interests [Table Text Block] |
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
($ in thousands) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Non-voting revenues interest in EAM |  | $ | 2,057 |  |  | $ | 1,803 |  |  | $ | 6,074 |  |  | $ | 5,389 |
Non-voting profits interest in EAM |  |  | 227 |  |  |  | 131 |  |  |  | 583 |  |  |  | 393 |
|  | $ | 2,284 |  |  | $ | 1,934 |  |  | $ | 6,657 |  |  | $ | 5,782 |

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