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Note G - Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 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 March 31, 2016, net of tax of $3,551
   $ 5,803  
         
Other comprehensive income before reclassifications, net of tax benefit of $667
     1,089  
Amounts reclassified from accumulated other comprehensive income, net of tax benefit of $113
     185  
Net current-period other comprehensive income
     1,274  
         
Balance at June 30, 2016, net of tax of $4,331
   $ 7,077  
         
Balance at December 31, 2015, net of tax of $3,250
   $ 5,310  
         
Other comprehensive income before reclassifications, net of tax benefit of $848
     1,385  
Amounts reclassified from accumulated other comprehensive income, net of tax benefit of $233
     382  
Net current-period other comprehensive income
     1,767  
         
Balance at June 30, 2016, net of tax of $4,331
   $ 7,077  
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  
Six Months Ended
June 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
   $ 83  
Non-operating (expense) income
Impairment expense
     532  
Non-operating (expense) income
Total before tax
     615  
Income before income taxes
Tax benefit
     233  
Income tax expense
Total after tax
   $ 382  
Net income