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Note 3 - Related Party Transactions (Tables)
 12 Months Ended
Apr. 30, 2021
Notes Tables  
Schedule of Non Voting Revenues Interest and Non Voting Profits Interests [Table Text Block]
      Fiscal Years Ended April 30,  
($ in thousands)
  
2021
    
2020
    
2019
  
Non-voting revenues interest in EAM
   $
15,190
     $
11,184
     $
8,260
  
Non-voting profits interest in EAM
    
2,131
      
1,166
      
1,049
  
    $
17,321
     $
12,350
     $
9,309