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Note G - Accumulated Other Comprehensive Income - Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Non-operating income (expense) $ 2,767 $ 1,235 $ 5,469 $ 1,203
Total before tax 5,615 5,603 11,965 16,779
Tax expense (2,169) (2,152) (4,627) (6,401)
Net income $ 3,446 $ 3,451 7,338 $ 10,378
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Total before tax [1]     3,678  
Tax expense [1]     (1,396)  
Net income [1]     2,282  
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Non-operating income (expense) [1]     3,720  
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Non-operating income (expense) [1]     $ (42)  
[1] Amounts in parentheses indicate debits to profit/loss