Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Allowance for Loan Losses - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	$ 8,227		$ 8,263	$ 8,227	$ 8,227
Charge-offs			(776)	(1,244)	(1,860)
Recoveries			88	184	255
Provision for loan losses	355	$ 701	556	804	1,641
Balance, end	8,131	7,971	8,131	7,971	8,263
Real Estate Construction Portfolio Segment[Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	863		612	863	863
Charge-offs			0	(2)	(2)
Recoveries			0	0	0
Provision for loan losses			(136)	(198)	(249)
Balance, end	476	663	476	663	612
Consumer Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	1,697		1,662	1,697	1,697
Charge-offs			(201)	(70)	(222)
Recoveries			1	0	0
Provision for loan losses			375	(73)	187
Balance, end	1,837	1,554	1,837	1,554	1,662
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	3,685		3,537	3,685	3,685
Charge-offs			(116)	(943)	(1,201)
Recoveries			24	25	50
Provision for loan losses			373	1,023	1,003
Balance, end	3,818	3,790	3,818	3,790	3,537
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	989		1,475	989	989
Charge-offs			(330)	(79)	(89)
Recoveries			0	131	132
Provision for loan losses			(204)	15	443
Balance, end	941	1,056	941	1,056	1,475
Public Sector and IDA Portfolio Segment[Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	132		327	132	132
Charge-offs			0	0	0
Recoveries			0	0	0
Provision for loan losses			159	146	195
Balance, end	486	278	486	278	327
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	576		602	576	576
Charge-offs			(129)	(150)	(346)
Recoveries			63	28	73
Provision for loan losses			(22)	98	299
Balance, end	514	552	514	552	602
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	285		48	285	285
Charge-offs			0	0	0
Recoveries			0	0	0
Provision for loan losses			11	(207)	(237)
Balance, end	$ 59	$ 78	$ 59	$ 78	$ 48