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Note 1 - Organization and Summary of Significant Accounting Policies (Tables)
3 Months Ended
Jul. 31, 2020
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
     
As of July 31, 2020      
 
($ in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Cash equivalents
  $
7,146
    $
-
    $
-
    $
7,146
 
Securities available-for-sale
   
30,673
     
-
     
-
     
30,673
 
    $
37,819
    $
-
    $
-
    $
37,819
 
     
As of April 30, 2020
 
($ in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Cash equivalents
  $
2,115
    $
-
    $
-
    $
2,115
 
Securities available-for-sale
   
29,204
     
-
     
-
     
29,204
 
    $
31,319
    $
-
    $
-
    $
31,319