Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Common Stock Including Additional Paid in Capital [Member]
Employee stock purchase plan (in shares)	692	402	1,821	1,201
Dividend reinvestment plan (in shares)	10,327	5,445	27,707	16,392
Stock grants to directors (in shares)	2,068		17,716	11,905
Share repurchase program (in shares)		111,893	222,385	231,013
Stock option exercises (in shares)				2,500
Cash dividends per common share (in dollars per share)	$ 0.28	$ 0.27	$ 0.84	$ 0.79