CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Mar. 31, 2024	Dec. 31, 2023
CONSOLIDATED BALANCE SHEETS
Preferred stock, par value (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, authorized (in shares)	30,000	30,000
Preferred stock, liquidation preference per share (in dollars per share)	$ 1,000	$ 1,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized (in shares)	30,000,000	30,000,000
Common stock, shares issued (in shares)	16,030,172	16,030,172
Common stock, shares outstanding (in shares)	15,378,065	15,295,135
Treasury stock, shares (in shares)	652,107	735,037