Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans (Details) - Allowance for Loan Losses - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	$ 8,263	$ 8,227	$ 8,349
Loans charged off	(2,120)	(1,860)	(1,820)
Recoveries of loans previously charged off	145	255	167
Provision for loan losses	2,009	1,641	1,531
Balance at end of year	8,297	8,263	8,227
Real Estate Construction Portfolio Segment[Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	612	863	1,070
Loans charged off	0	(2)	(184)
Recoveries of loans previously charged off	0	0	44
Provision for loan losses	(36)	(249)	(67)
Balance at end of year	576	612	863
Consumer Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	1,662	1,697	2,263
Loans charged off	(205)	(222)	(256)
Recoveries of loans previously charged off	2	0	1
Provision for loan losses	407	187	(311)
Balance at end of year	1,866	1,662	1,697
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	3,537	3,685	3,442
Loans charged off	(1,114)	(1,201)	(64)
Recoveries of loans previously charged off	49	50	25
Provision for loan losses	1,637	1,003	282
Balance at end of year	4,109	3,537	3,685
Commercial Non Real Estate Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	1,475	989	959
Loans charged off	(490)	(89)	(968)
Recoveries of loans previously charged off	1	132	18
Provision for loan losses	(331)	443	980
Balance at end of year	655	1,475	989
Public Sector and IDA Portfolio Segment[Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	327	132	142
Loans charged off	0	0	0
Recoveries of loans previously charged off	0	0	0
Provision for loan losses	109	195	(10)
Balance at end of year	436	327	132
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	602	576	424
Loans charged off	(311)	(346)	(348)
Recoveries of loans previously charged off	93	73	79
Provision for loan losses	243	299	421
Balance at end of year	627	602	576
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of year	48	285	49
Loans charged off	0	0	0
Recoveries of loans previously charged off	0	0	0
Provision for loan losses	(20)	(237)	236
Balance at end of year	$ 28	$ 48	$ 285