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Note E - Accumulated Other Comprehensive Income (Loss) (Details) - Accumulated Other Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Note E - Accumulated Other Comprehensive Income (Loss) (Details) - Accumulated Other Comprehensive Income [Line Items]        
Recognized actuarial loss (a) $ 297 [1] $ 450 [1] $ 1,080 [1] $ 1,346
Total before income tax 787 450 4,557 1,346
Income tax (332) 3 (1,524) 5
Net of income tax 455 453 3,033 1,351
Cost Of Goods Sold [Member]
        
Note E - Accumulated Other Comprehensive Income (Loss) (Details) - Accumulated Other Comprehensive Income [Line Items]        
Settlement loss 324 [2]    [2] 2,298 [2]    [2]
Selling And General And Administrative Expenses [Member]
        
Note E - Accumulated Other Comprehensive Income (Loss) (Details) - Accumulated Other Comprehensive Income [Line Items]        
Settlement loss $ 166 [3]    [3] $ 1,179 [3]    [3]
[1] The recognized actuarial loss is included in the computation of net periodic benefit cost. See Note D for additional details.
[2] This portion of the settlement loss is included in Cost of products sold on the Statements of Income.
[3] This portion of the settlement loss in included in Selling, general & administrative expenses on the Statements of Income.