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Note 7 - Related Party Transactions (Tables) | 9 Months Ended
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Jan. 31, 2022
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) |  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Non-voting revenues interest in EAM |  | $ | 4,120 |  |  | $ | 4,104 |  |  | $ | 12,532 |  |  | $ | 11,113 |
Non-voting profits interest in EAM |  |  | 535 |  |  |  | 630 |  |  |  | 1,820 |  |  |  | 1,479 |
|  | $ | 4,655 |  |  | $ | 4,734 |  |  | $ | 14,352 |  |  | $ | 12,592 |

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