Note 7 - Loans and Allowance for Loan Losses - Activity In the Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Balance, beginning of period	$ 9,222	$ 9,485	$ 9,344	$ 10,315
Provision for loan losses	(379)	(190)	(298)	(819)
Recoveries	330	92	830	292
Loans charged off	(125)	(241)	(828)	(642)
Balance, end of period	9,048	9,146	9,048	9,146
Real Estate Portfolio Segment [Member]
Balance, beginning of period	7,961	8,404	8,205	9,173
Provision for loan losses	(376)	(425)	(526)	(1,025)
Recoveries	259	31	674	133
Loans charged off	(16)	(88)	(525)	(359)
Balance, end of period	7,828	7,922	7,828	7,922
Commercial Portfolio Segment [Member]
Balance, beginning of period	900	806	854	820
Provision for loan losses	25	203	153	193
Recoveries	44	52	110	107
Loans charged off	(86)	(134)	(234)	(193)
Balance, end of period	883	927	883	927
Consumer Portfolio Segment [Member]
Balance, beginning of period	361	275	285	322
Provision for loan losses	(28)	32	75	13
Recoveries	27	9	46	52
Loans charged off	(23)	(19)	(69)	(90)
Balance, end of period	$ 337	$ 297	$ 337	$ 297