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Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Preferred stock, par value (usd per share) $ 1.25 $ 1.25
Preferred stock, shares authorized (in shares) 500,000 500,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding 0 0
Common stock, stated value (usd per share) $ 0.05205 $ 0.05205
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 9,484,769 9,439,255
Common stock, shares outstanding (in shares) 9,484,769 9,430,224
Treasury stock - common - shares (in shares) 0 9,031