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Note 5 - Variable Interest Entity (Tables)
12 Months Ended
Apr. 30, 2018
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, 2018
  $
60,203
    $
58,233
    $
-
    $
58,233
 
As of April 30, 2017
  $
60,432
    $
58,223
    $
-
    $
58,223