Condensed Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Common Stock [Member]
Employee stock purchase plan, shares (in shares)	338	364
Dividend reinvestment plan, shares (in shares)	35,319	17,876
Stock option exercises, shares (in shares)	20,000	4,700
Stock grants to directors (in shares)	62
Share repurchase program, shares (in shares)		147,656
Retained Earnings [Member]
Cash dividends per common share (in dollars per share)	$ 0.18	$ 0.16
Cash dividends per common share (in dollars per share)	$ 0.18	$ 0.16