Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Allowance for Loan Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	$ 8,257	$ 8,297	$ 8,263	$ 8,227
Charge-offs	(260)	(191)
Recoveries	53	158
Provision for loan losses	201	103
Real Estate Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	467	850	612	863
Charge-offs		(2)
Provision for loan losses	(145)	(11)
Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	1,620	1,814	1,662	1,697
Charge-offs	(72)	(54)
Provision for loan losses	30	171
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	3,711	3,694	3,537	3,685
Charge-offs	(100)	(52)
Recoveries	12	8
Provision for loan losses	262	53
Commercial Non Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	1,416	861	1,475	989
Recoveries		131
Provision for loan losses	(59)	(259)
Public Sector and IDA [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	433	202	327	132
Provision for loan losses	106	70
Consumer Non Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	576	529	602	576
Charge-offs	(88)	(83)
Recoveries	41	19
Provision for loan losses	21	17
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	34	347	48	285
Provision for loan losses	$ (14)	$ 62