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Note 6 - Comprehensive Income (Tables)
 3 Months Ended
Jul. 31, 2016
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
($ in thousands)
  
Amount Before
Tax
    
Tax Benefit
    
Amount Net of
Tax
  
Change in unrealized gains on securities
   $ 238     $ (84 )   $ 154  
                         
    $ 238     $ (84 )   $ 154  
($ in thousands)
  
Amount Before
Tax
    
Tax Provision
    
Amount Net of
Tax
  
Change in unrealized gains on securities
   $ (142 )   $ 50     $ (92 )
                         
    $ (142 )   $ 50     $ (92 )