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Note 7 - Related Party Transactions (Tables)
 6 Months Ended
Oct. 31, 2018
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)
  
2018
    
2017
    
2018
    
2017
  
Non-voting revenues interest in EAM
   $
2,095
     $
2,039
     $
4,063
     $
4,017
  
Non-voting profits interest in EAM
    
289
      
198
      
592
      
356
  
    $
2,384
     $
2,237
     $
4,655
     $
4,373