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Note 7 - Related Party Transactions (Tables) | 6 Months Ended
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Oct. 31, 2023
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) |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Non-voting revenues interest in EAM |  | $ | 2,721 |  |  | $ | 2,623 |  |  | $ | 5,337 |  |  | $ | 5,405 |
Non-voting profits interest in EAM |  |  | 274 |  |  |  | 193 |  |  |  | 515 |  |  |  | 426 |
|  | $ | 2,995 |  |  | $ | 2,816 |  |  | $ | 5,852 |  |  | $ | 5,831 |

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