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Note 3 - Related Party Transactions (Tables)
12 Months Ended
Apr. 30, 2016
Notes Tables  
Schedule of Non Voting Revenues Interest and Non Voting Profits Interests [Table Text Block]
   
Fiscal Years Ended April 30,
 
($ in thousands)
 
2016
   
2015
   
2014
 
Non-voting revenues interest in EAM
  $ 7,211     $ 7,346     $ 6,767  
Non-voting profits interest in EAM
    440       624       732  
    $ 7,651     $ 7,970     $ 7,499