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Note F - Accumulated Other Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Cost of Sales [Member]        
Settlement loss [1] $ 1,320,000 $ 2,279,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Selling, General and Administrative Expenses [Member]        
Settlement loss [2] 570,000 1,063,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Recognized actuarial loss (a) [3] 351,000 397,000 1,053,000 1,136,000
Total before income tax 351,000 2,287,000 1,053,000 4,478,000
Income tax (123,000) (839,000) (343,000) (1,642,000)
Net of income tax 228,000 1,448,000 710,000 2,836,000
Total before income tax 10,402,000 9,048,000 29,293,000 29,826,000
Income tax $ (3,475,000) $ (3,155,000) $ (9,464,000) $ (10,029,000)
[1] This portion of the settlement loss is included in cost of products sold on the condensed consolidated statements of income.
[2] This portion of the settlement loss in included in Selling, general & administrative expenses on the condensed consolidated statements of income.
[3] The recognized actuarial loss is included in the computation of net periodic benefit cost. See Note E for additional details.