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Note 5 - Variable Interest Entity (Tables)
12 Months Ended
Apr. 30, 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 April 30, 2021
  $
64,197
    $
60,977
    $
-
    $
60,977
 
As of April 30, 2020
  $
61,335
    $
59,165
    $
-
    $
59,165