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Note 3 - Variable Interest Entity (Tables)
6 Months Ended
Oct. 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 October 31, 2020 (unaudited)
  $
63,549
    $
60,351
    $
-
    $
60,351
 
As of April 30, 2020
  $
61,335
    $
59,165
    $
-
    $
59,165