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Note 3 - Variable Interest Entity (Tables)
3 Months Ended
Jul. 31, 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 July 31, 2017 (unaudited)
  $
60,692
    $
58,454
    $
-
    $
58,454
 
As of April 30, 2017
  $
60,432
    $
58,223
    $
-
    $
58,223