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Note 1 - Organization and Summary of Significant Accounting Policies (Tables)
6 Months Ended
Oct. 31, 2018
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   
As of October 31, 2018
 
($ in thousands)
 
Level 1
   
Level 2
   
Level 3
   
Total
 
Cash equivalents
  $
3,726
    $
-
    $
-
    $
3,726
 
Securities available-for-sale
   
19,060
     
-
     
-
     
19,060
 
    $
22,786
    $
-
    $
-
    $
22,786
 
   
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