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Note 3 - Variable Interest Entity (Tables)
9 Months Ended
Jan. 31, 2020
Notes Tables  
Schedule of Variable Interest Entities [Table Text Block]
    Value Line  
($ in thousands)
 
VIE Assets
   
Investment in EAM Trust (1)
   
Liabilities
   
Maximum Exposure to Loss
 
As of January 31, 2020 (unaudited)
  $
62,371
    $
59,612
    $
-
    $
59,612
 
As of April 30, 2019
  $
60,683
    $
58,625
    $
-
    $
58,625