Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 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, unvested shares (in shares)	22,569	18,062