Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Common Stock Including Additional Paid in Capital [Member]
Employee stock purchase plan (in shares)	404	692	1,106	1,821
Dividend reinvestment plan (in shares)	7,904	10,327	20,814	27,707
Stock option exercises (in shares)	2,000		2,000
Share repurchase program (in shares)	288,863		635,773	222,385
Stock grants to directors (in shares)		2,068	10,489	17,716
Retained Earnings [Member]
Cash dividends per common share (in dollars per share)	$ 0.30	$ 0.28	$ 0.88	$ 0.84
Cash dividends per common share (in dollars per share)	$ 0.30	$ 0.28	$ 0.88	$ 0.84