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Note 7 - Related Party Transactions (Tables) | 3 Months Ended
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Jul. 31, 2018
Notes Tables |
Schedule of Non Voting Revenues Interest and Non Voting Profits Interests [Table Text Block] |
|  | Three Months Ended July 31, |
($ in thousands) |  | 2018 |  |  | 2017 |
Non-voting revenues interest in EAM |  | $ | 1,968 |  |  | $ | 1,978 |
Non-voting profits interest in EAM |  |  | 303 |  |  |  | 158 |
|  | $ | 2,271 |  |  | $ | 2,136 |

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