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Note 5 - Variable Interest Entity (Tables)
12 Months Ended
Apr. 30, 2017
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, 2017
  $
60,432
    $
58,223
    $
-
    $
58,223
 
As of April 30, 2016
  $
60,292
    $
57,942
    $
-
    $
57,942