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Note 1 - Organization and Summary of Significant Accounting Policies (Tables)
3 Months Ended
Jul. 31, 2019
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
As of July 31, 2019
 
($ in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Cash equivalents
  $
3,080
    $
-
    $
-
    $
3,080
 
Securities available-for-sale
   
22,585
     
-
     
-
     
22,585
 
    $
25,665
    $
-
    $
-
    $
25,665
 
   
As of April 30, 2019
 
($ in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Cash equivalents
  $
5,617
    $
-
    $
-
    $
5,617
 
Securities available-for-sale
   
21,828
     
-
     
-
     
21,828
 
    $
27,445
    $
-
    $
-
    $
27,445