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Note 3 - Variable Interest Entity (Tables)
9 Months Ended
Jan. 31, 2019
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, 2019 (unaudited)
  $
60,359
    $
58,358
    $
-
    $
58,358
 
As of April 30, 2018
  $
60,203
    $
58,233
    $
-
    $
58,233