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Note G - Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Unrealized gains and
losses on available-
for-sale securities
  
   
(in thousands)
  
Balance at
June 30, 2017, net of tax of $3,851
   $
6,290
  
         
Other comprehensive
income before reclassifications, net of tax of $266
    
437
  
Amounts reclassified from accumulated other comprehensive
income, net of tax of $(768)
    
(1,256
 )
Net current-period other comprehensive income
    
(819
 )
         
Balance at
September 30, 2017, net of tax of $3,349
   $
5,471
  
         
Balance at December 31, 2016, net of tax of $4,576
   $
7,476
  
         
Other comprehensive income before reclassifications, net of tax benefit of $
169
    
277
  
Amounts reclassified from accumulated other comprehensive income, net of tax of $
(1,396)
    
(2,282
 )
Net current-period other comprehensive income
    
(2,005
 )
         
Balance at
September 30, 2017, net of tax of $3,349
   $
5,471
  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
 
  
Amounts Reclassified from
Accumulated
Other Comprehensive
Income (a)
  
 
Details about Accumulated Other Comprehensive Income
Component
  
Nine
Months Ended
September
30, 2017
  
Statement of
Operations Classification
   
(in thousands)
    
Unrealized gains and losses on available-for-sale securities:
          
Prior period unrealized gain
(loss) on securities sold
   $
3,720
  
Non-operating
income (expense)
Impairment expense
    
(42
 )
Non-operating
income (expense)
Total before tax
    
3,678
  
Income before income taxes
Tax
expense
    
(1,396
 )
Income tax expense
Total after tax
   $
2,282
  
Net income