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Note 11 - Comprehensive Income (Tables)
 12 Months Ended
Apr. 30, 2017
Notes Tables  
Comprehensive Income (Loss) [Table Text Block]
   
Fiscal Year Ended April 30, 2017
  
($ in thousands)
  
Amount Before
Tax
    
Tax Expense/
(Benefit)
    
Amount Net of
Tax
  
Change in unrealized gains on securities
   $
476
    $
(168
 )   $
308
 
Less: Gains realized in net income
    
39
     
(14
 )    
25
 
    $
515
    $
(182
 )   $
333
 
   
Fiscal Year Ended April 30, 2016
  
($ in thousands)
  
Amount Before
Tax
    
Tax Expense/
(Benefit)
    
Amount Net of
Tax
  
Change in unrealized gains on securities
   $
(300
 )   $
106
    $
(194
 )
Less: Gains realized in net income
    
329
     
(115
 )    
214
 
    $
29
    $
(9
 )   $
20
 
   
Fiscal Year Ended April 30, 2015
  
($ in thousands)
  
Amount Before
Tax
    
Tax Expense/
(Benefit)
    
Amount Net of
Tax
  
Change in unrealized gains on securities
   $
(274
 )   $
96
    $
(178
 )
Less: Gains realized in net income
    
57
     
(20
 )    
37
 
    $
(217
 )   $
76
    $
(141
 )