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Note 3 - Variable Interest Entity (Tables)
3 Months Ended
Jul. 31, 2016
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, 2016 (unaudited)
  $ 60,955     $ 58,123     $ -     $ 58,123  
As of April 30, 2016
  $ 60,292     $ 57,942     $ -     $ 57,942