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Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Consolidated Balance Sheets [Abstract]    
Accounts receivable, less allowances $ 1,865 $ 2,039
Common stock, par value $ 2 $ 2
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 5,376,254 5,377,937
Common stock, shares outstanding 5,376,254 5,377,937
Treasury shares, at par 691,472 689,472
Common stock, shares issued to rabbi trust 183,929 184,036