Note 4 - Mortgage Banking Derivative (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Mortgage Banking Derivative [Member]
Derivative, Notional Amount	$ 81,700	$ 53,000	$ 81,700	$ 53,000
Derivative Asset	217		217		$ 24
Derivative Liability					30
Noninterest Income, Other	(46)	9	274	63
Other Assets [Member]
Derivative Asset	217	197	217	197
Other Liabilities [Member]
Derivative Liability	222	245	222	245
Designated as Hedging Instrument [Member]
Noninterest Income, Other	151	$ 327	(156)	$ 9
Derivative, Notional Amount	250,000		250,000		$ 250,000
Derivative Liability	$ 222		$ 222