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Note G - Accumulated Other Comprehensive Income - Reclassification Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Non-operating income (expense) $ 650 $ (10) $ 2,702 $ (32)
Total before tax 2,613 6,434 6,350 11,176
Tax expense (1,004) (2,442) (2,458) (4,249)
Net Income $ 1,609 $ 3,992 3,892 $ 6,927
Reclassification out of Accumulated Other Comprehensive Income [Member]        
Total before tax [1]     1,654  
Tax expense [1]     (628)  
Net Income [1]     1,026  
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Non-operating income (expense) [1]     1,681  
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Non-operating income (expense) [1]     $ (27)  
[1] Amounts in parentheses indicate debits to profit/loss