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Note G - Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016, net of tax of $4,331
   $ 7,077  
         
Other comprehensive income before reclassifications, net of tax of $230
     (376 )
Amounts reclassified from accumulated other comprehensive income, net of tax of $297
     (485 )
Net current-period other comprehensive income
     (861 )
         
Balance at September 30, 2016, net of tax of $3,804
   $ 6,216  
         
Balance at December 31, 2015, net of tax of $3,250
   $ 5,310  
         
Other comprehensive income before reclassifications, net of tax benefit of $618
     1,009  
Amounts reclassified from accumulated other comprehensive income, net of tax of $64
     (103 )
Net current-period other comprehensive income
     906  
         
Balance at September 30, 2016, net of tax of $3,804
   $ 6,216  
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, 2016
   Statement of Operations Classification
   
(in thousands)
    
Unrealized gains and losses on available-for-sale securities:
          
Prior period unrealized gain (loss) on securities sold
   $ 876  
Non-operating income (expense)
Impairment expense
     (709 )
Non-operating income (expense)
Total before tax
     167  
Income before income taxes
Tax expense
     (64 )
Income tax expense
Total after tax
   $ 103  
Net income