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Note G - Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Non-operating (expense) income [1]     $ 83  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]        
Non-operating (expense) income [1]     532  
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Total before tax [1]     615  
Tax benefit [1]     233  
Net income [1]     382  
Non-operating (expense) income $ (10) $ 272 (32) $ 517
Total before tax 6,434 11,510 11,176 20,285
Tax benefit 2,442 4,471 4,249 7,877
Net income $ 3,992 $ 7,039 $ 6,927 $ 12,408
[1] Amounts in parentheses indicate debits to profit/loss