Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Stock [Member]
Proceeds from shares issued under common stock offering (in shares)			18,691,589
Proceeds from shares issued under common stock offering, offering costs			$ 825
Options exercised (in shares)	174,850	197,975	226,275
Additional Paid-in Capital [Member]
Conversion of subordinated debt, shares (in shares)	1,624,614	36,922
Options exercised (in shares)	174,850	197,975	226,275