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Consolidated Balance Sheets (Parentheticals) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Common stock, par value (in dollars per share) $ 1 $ 1
Common stock, authorized (in shares) 12,000,000 12,000,000
Common stock, issued (in shares) 7,440,518 7,440,518
Common stock, outstanding (in shares) 7,025,433 7,006,323
Treasury stock, shares (in shares) 415,085 434,195