Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Employee stock purchase plan (in shares)	1,481	2,264	1,507
Dividend reinvestment plan (in shares)	27,562	35,479	21,503
Stock option exercises (in shares)	2,000	753	8,200
Stock grants to directors (in shares)	10,489	17,716	11,905
Share repurchase program (in shares)	683,191	236,393	233,300
Cash dividends per common share (in dollars per share)	$ 1.18	$ 1.12	$ 1.06