Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2018	Dec. 31, 2017
Shareholders’ Equity
Common stock, par value (in dollars per share)	$ 3.13	$ 3.13
Common stock, shares authorized (in shares)	8,000,000	8,000,000
Common stock, shares issued (in shares)	3,773,836	3,762,677
Common stock, shares outstanding (in shares)	3,773,836	3,762,677
Common stock, non-vested shares (in shares)	22,569	18,062