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Note 3 - Related Party Transactions (Tables) | 12 Months Ended
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Apr. 30, 2017
Notes Tables |
Schedule of Non Voting Revenues Interest and Non Voting Profits Interests [Table Text Block] |
|  | Fiscal Years Ended April 30, |
($ in thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Non-voting revenues interest in EAM |  | $ | 7,195 |  |  | $ | 7,211 |  |  | $ | 7,346 |
Non-voting profits interest in EAM |  |  | 519 |  |  |  | 440 |  |  |  | 624 |
|  | $ | 7,714 |  |  | $ | 7,651 |  |  | $ | 7,970 |

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