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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Note E - Accumulated Other Comprehensive Income (Loss) (Details) - Accumulated Other Comprehensive Income [Line Items]        
Recognized actuarial loss (a) $ 352 [1] $ 772 [1] $ 783 [1] $ 1,220
Total before income tax 1,953 772 3,770 1,220
Income tax (584) (171) (1,192) (321)
Net of income tax 1,369 601 2,578 899
Cost Of Goods Sold [Member]
        
Note E - Accumulated Other Comprehensive Income (Loss) (Details) - Accumulated Other Comprehensive Income [Line Items]        
Settlement loss 1,058 [2]    [2] 1,974 [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 $ 543 [3]    [3] $ 1,013 [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.