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Note 7 - Related Party Transactions (Tables) | 6 Months Ended
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Oct. 31, 2019
Notes Tables |
Schedule of Non Voting Revenues Interest and Non Voting Profits Interests [Table Text Block] |
|  | Three Months Ended October 31, |  |  | Six Months Ended October 31, |
($ in thousands) |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Non-voting revenues interest in EAM |  | $ | 2,768 |  |  | $ | 2,095 |  |  | $ | 5,356 |  |  | $ | 4,063 |
Non-voting profits interest in EAM |  |  | 290 |  |  |  | 289 |  |  |  | 573 |  |  |  | 592 |
|  | $ | 3,058 |  |  | $ | 2,384 |  |  | $ | 5,929 |  |  | $ | 4,655 |

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