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Note 1 - Organization and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Apr. 30, 2016
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
As of April 30, 2016
 
($ in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Cash equivalents
  $ 12,037     $ -     $ -     $ 12,037  
Securities available-for-sale
    3,637       -       -       3,637  
    $ 15,674     $ -     $ -     $ 15,674  
   
As of April 30, 2015
 
($ in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Cash equivalents
  $ 5,272     $ -     $ -     $ 5,272  
Securities available-for-sale
    9,632       -       -       9,632  
    $ 14,904     $ -     $ -     $ 14,904