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Note 1 - Organization and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Apr. 30, 2019
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
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
 
   
As of April 30, 2018
 
($ in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Cash equivalents
  $
4,982
    $
-
    $
-
    $
4,982
 
Securities available-for-sale
   
17,844
     
-
     
-
     
17,844
 
    $
22,826
    $
-
    $
-
    $
22,826