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Note G - Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 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 December 31, 2016, net of tax of $4,576
   $
7,476
  
         
Other comprehensive income before reclassifications, net of tax of $(15)
    
(22
 )
Amounts reclassified from accumulated other comprehensive income,
net of tax of $(551)
    
(900
 )
Net other comprehensive (loss)
    
(922
 )
         
Balance at March 31, 2017, net of tax of $4,011
   $
6,554
  
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  
Three Months Ended
March 31, 2017
   Statement of Operations Classification
   
(in thousands)
    
Unrealized gains and losses on available-for-sale securities:
          
Prior period unrealized gain (loss) on securities sold
   $
1,451
  
Non-operating (expense) income
Tax expense
    
(551
 )
Income tax expense
Total after tax
   $
900
  
Net income