Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Employee stock purchase plan (in shares)	1,410	1,388	1,481
Dividend reinvestment plan (in shares)	27,306	25,941	27,562
Stock option exercises (in shares)		1,355	2,000
Stock grants to directors for retainer fees (in shares)	11,529	11,166	10,489
Share repurchase program (in shares)			683,191
Cash dividends per common share (in dollars per share)	$ 1.34	$ 1.26	$ 1.18