Note 4 - Loans and Allowance for Loan Losses (Details) - Allowance for Loan Losses Activity by Portfolio Segment - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Allowance for loan losses:
Beginning balance	$ 7,444	$ 7,928	$ 8,334	$ 6,155
Provision for loan losses	(11)	(682)	710	1,198
Loans charged off	(945)	(635)	(3,273)	(1,441)
Recoveries	414	353	1,131	1,052
Total ending allowance balance	6,902	6,964	6,902	6,964
Residential Portfolio Segment [Member]
Allowance for loan losses:
Beginning balance	1,230	1,878	1,426	1,169
Provision for loan losses	(166)	(240)	(256)	513
Loans charged off	(40)	(157)	(263)	(350)
Recoveries	219	99	336	248
Total ending allowance balance	1,243	1,580	1,243	1,580
Commercial Real Estate Portfolio Segment [Member]
Allowance for loan losses:
Beginning balance	2,795	3,276	4,195	2,914
Provision for loan losses	(214)	(551)	(272)	(111)
Loans charged off	(596)	(78)	(1,970)	(235)
Recoveries	15	3	47	82
Total ending allowance balance	2,000	2,650	2,000	2,650
Commercial Portfolio Segment [Member]
Allowance for loan losses:
Beginning balance	2,287	1,625	1,602	1,279
Provision for loan losses	205	(90)	697	92
Loans charged off		(37)	(24)	(41)
Recoveries	11	114	228	282
Total ending allowance balance	2,503	1,612	2,503	1,612
Consumer Portfolio Segment [Member]
Allowance for loan losses:
Beginning balance	1,132	1,149	1,111	793
Provision for loan losses	164	199	541	704
Loans charged off	(309)	(363)	(1,016)	(815)
Recoveries	169	137	520	440
Total ending allowance balance	$ 1,156	$ 1,122	$ 1,156	$ 1,122