Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Allowance for Loan Losses - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance			$ 8,263	$ 8,227	$ 8,227
Charge-offs			(1,002)	(1,568)	(1,860)
Recoveries			122	212	255
Provision for loan losses	$ 178	$ 356	734	1,160	1,641
Balance	8,117	8,031	8,117	8,031	8,263
Real Estate Construction Portfolio Segment[Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance			612	863	863
Charge-offs			0	(2)	(2)
Recoveries			0	0	0
Provision for loan losses			(77)	(277)	(249)
Balance	535	584	535	584	612
Consumer Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance			1,662	1,697	1,697
Charge-offs			(201)	(97)	(222)
Recoveries			1	0	0
Provision for loan losses			332	78	187
Balance	1,794	1,678	1,794	1,678	1,662
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance			3,537	3,685	3,685
Charge-offs			(155)	(1,115)	(1,201)
Recoveries			36	33	50
Provision for loan losses			420	1,072	1,003
Balance	3,838	3,675	3,838	3,675	3,537
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance			1,475	989	989
Charge-offs			(453)	(79)	(89)
Recoveries			1	132	132
Provision for loan losses			(153)	22	443
Balance	870	1,064	870	1,064	1,475
Public Sector and IDA Portfolio Segment[Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance			327	132	132
Charge-offs			0	0	0
Recoveries			0	0	0
Provision for loan losses			170	148	195
Balance	497	280	497	280	327
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance			602	576	576
Charge-offs			(193)	(275)	(346)
Recoveries			84	47	73
Provision for loan losses			21	261	299
Balance	514	609	514	609	602
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance			48	285	285
Charge-offs			0	0	0
Recoveries			0	0	0
Provision for loan losses			21	(144)	(237)
Balance	$ 69	$ 141	$ 69	$ 141	$ 48