Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 5	$ 5
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares outstanding (in shares)	5,038,066	4,999,083
Restricted Stock [Member]
Stockholders' equity:
Nonvested restricted stock (in shares)	54,593	46,989