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Note 6 - Comprehensive Income (Tables)
 9 Months Ended
Jan. 31, 2020
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
($ in thousands)
  
Amount Before Tax
    
Tax Expense
    
Amount Net of Tax
  
Change in unrealized gains on securities
   $
592
     $
(260
 )   $
332
  
    $
592
     $
(260
 )   $
332
  
($ in thousands)
  
Amount Before Tax
    
Tax Expense
    
Amount Net of Tax
  
Change in unrealized gains on securities
   $
438
     $
(93
 )   $
345
  
    $
438
     $
(93
 )   $
345