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Note 5 - Variable Interest Entity (Tables)
12 Months Ended
Apr. 30, 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 April 30, 2016
  $ 60,292     $ 57,942     $ -     $ 57,942  
As of April 30, 2015
  $ 60,159     $ 58,048     $ -     $ 58,048