Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - $ / shares	3 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015
Common Stock [Member]
Common cash dividends declared, per share (in dollars per share)	$ 0.04	$ 0.04	$ 0.04
Proceeds from issuance of common stock, Employee Stock Purchase Plan, Shares (in shares)	6,982	5,054	8,558	5,679
Proceeds from issuance of common stock, stock options exercised, shares (in shares)	20,975	30,331	17,240	9,688
Exchange of common stock, restricted stock vested, shares (in shares)		3,939		3,272
Proceeds from issuance of common stock, net of issuance costs, shares (in shares)	1,215,000		3,680,000
Exchange of shares of common stock in connection with stock options exercised (in shares)			630
Common cash dividends declared, per share (in dollars per share)	$ 0.04		$ 0.04