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Note 6 - Comprehensive Income (Tables)
3 Months Ended
Jul. 31, 2017
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
  $
142
    $
(50
)   $
92
 
    $
142
    $
(50
)   $
92
 
($ in thousands)
 
Amount Before
Tax
   
Tax
Expense
   
Amount Net of
Tax
 
Change in unrealized gains on securities
  $
238
    $
(84
)   $
154
 
    $
238
    $
(84
)   $
154