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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Accounts receivable, less allowances $ 2,485 $ 2,326
Common stock, par value $ 2 $ 2
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 5,170,214 5,221,062
Common stock, shares outstanding 5,170,214 5,221,062
Common stock, shares issued to rabbi trust 296,817 296,635
Treasury stock shares 1,071,589 1,018,013