Note 4 - Loans and Allowance for Loan Losses (Details) - Allowance for Loan Losses Activity by Portfolio Segment - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Allowance for loan losses:
Beginning balance	$ 8,320	$ 6,462	$ 8,334	$ 6,155
Provision for loan losses	799	1,386	721	1,880
Loans charged off	(1,960)	(340)	(2,328)	(806)
Recoveries	285	420	717	699
Total ending allowance balance	7,444	7,928	7,444	7,928
Residential Portfolio Segment [Member]
Allowance for loan losses:
Beginning balance	1,465	1,437	1,426	1,169
Provision for loan losses	(121)	444	(90)	753
Loans charged off	(126)	(139)	(223)	(193)
Recoveries	12	136	117	149
Total ending allowance balance	1,230	1,878	1,230	1,878
Commercial Real Estate Portfolio Segment [Member]
Allowance for loan losses:
Beginning balance	4,210	2,845	4,195	2,914
Provision for loan losses	(64)	383	(58)	440
Loans charged off	(1,366)		(1,374)	(157)
Recoveries	15	48	32	79
Total ending allowance balance	2,795	3,276	2,795	3,276
Commercial Portfolio Segment [Member]
Allowance for loan losses:
Beginning balance	1,738	1,331	1,602	1,279
Provision for loan losses	478	201	492	182
Loans charged off	(22)	(4)	(24)	(4)
Recoveries	93	97	217	168
Total ending allowance balance	2,287	1,625	2,287	1,625
Consumer Portfolio Segment [Member]
Allowance for loan losses:
Beginning balance	907	849	1,111	793
Provision for loan losses	506	358	377	505
Loans charged off	(446)	(197)	(707)	(452)
Recoveries	165	139	351	303
Total ending allowance balance	$ 1,132	$ 1,149	$ 1,132	$ 1,149