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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Consolidated Balance Sheets [Abstract]    
Accounts receivable, less allowances $ 1,674 $ 1,627
Common shares, par value $ 2 $ 2
Common shares, shares authorized 15,000,000 15,000,000
Common shares, shares issued 5,332,454 5,333,630
Common shares, shares outstanding 5,332,454 5,333,630
Treasury stock, at par 640,638 639,138