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Note 1 - Organization and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Jan. 31, 2017
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
As of January 31, 2017
  
($ in thousands)
  
Level 1
    
Level 2
    
Level 3
    
Total
  
Cash equivalents
   $
5,401
    $
-
    $
-
    $
5,401
 
Securities available-for-sale
    
14,945
     
-
     
-
     
14,945
 
    $
20,346
    $
-
    $
-
    $
20,346
 
   
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