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Note 7 - Related Party Transactions (Tables) | 6 Months Ended
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Oct. 31, 2016
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) |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Non-voting revenues interest in EAM |  | $ | 1,799 |  |  | $ | 1,819 |  |  | $ | 3,586 |  |  | $ | 3,721 |
Non-voting profits interest in EAM |  |  | 133 |  |  |  | 121 |  |  |  | 262 |  |  |  | 261 |
|  | $ | 1,932 |  |  | $ | 1,940 |  |  | $ | 3,848 |  |  | $ | 3,982 |

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