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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Accounts receivable, less allowances $ 3,340 $ 3,849
Common stock, par value $ 2 $ 2
Common stock, shares authorized 15,000,000 15,000,000
Common stock, shares issued 4,934,506 4,992,979
Common stock, shares outstanding 4,934,506 4,992,979
Common stock, shares issued to rabbi trust 264,886 267,641
Treasury stock shares 1,567,692 1,431,235