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Note 3 - Variable Interest Entity (Tables)
9 Months Ended
Jan. 31, 2021
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, 2021 (unaudited)
  $
64,357
    $
60,919
    $
-
    $
60,919
 
As of April 30, 2020
  $
61,335
    $
59,165
    $
-
    $
59,165