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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Accounts receivable, less allowances $ 2,326 $ 2,370
Common stock, par value $ 2 $ 2
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 5,221,062 5,397,138
Common stock, shares outstanding 5,221,062 5,397,138
Common stock, shares issued to rabbi trust 296,635 292,609
Treasury stock, shares 1,018,013 819,424