Note 5 - Loans (Details) - Allowance for Credit Losses and Recorded Investment in Financing Receivables - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 10,820	$ 14,172
Ending balance	11,180	10,820
ALLL:
Allowance for credit losses: individually evaluated for impairment			$ 832	$ 1,556
Allowance for credit losses: collectively evaluated for impairment			10,348	9,264
Allowance for credit losses	10,820	10,820	11,180	10,820
Gross loans:
Loans, individually evaluated for impairment			21,390	31,408
Loans, collectively evaluated for impairment			695,249	629,490
Gross loans			716,639	660,898
Charge offs	(2,376)	(7,319)
Recoveries	2,736	792
Provision		3,175
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,503	7,057
Ending balance	2,493	3,503
ALLL:
Allowance for credit losses: individually evaluated for impairment			122	314
Allowance for credit losses: collectively evaluated for impairment			2,371	3,189
Allowance for credit losses	3,503	3,503	2,493	3,503
Gross loans:
Loans, individually evaluated for impairment			2,043	6,597
Loans, collectively evaluated for impairment			130,762	143,656
Gross loans			132,805	150,253
Charge offs	(700)	(4,242)
Recoveries	1,692	582
Provision	(2,002)	106
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	4,875	2,784
Ending balance	5,784	4,875
ALLL:
Allowance for credit losses: individually evaluated for impairment			97	432
Allowance for credit losses: collectively evaluated for impairment			5,687	4,443
Allowance for credit losses	4,875	4,875	5,784	4,875
Gross loans:
Loans, individually evaluated for impairment			7,733	11,753
Loans, collectively evaluated for impairment			420,259	352,553
Gross loans			427,992	364,306
Charge offs	(428)	(2,699)
Recoveries	771	2
Provision	566	4,788
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,670	2,493
Ending balance	1,577	1,670
ALLL:
Allowance for credit losses: individually evaluated for impairment			600	795
Allowance for credit losses: collectively evaluated for impairment			977	875
Allowance for credit losses	1,670	1,670	1,577	1,670
Gross loans:
Loans, individually evaluated for impairment			11,582	13,023
Loans, collectively evaluated for impairment			94,387	97,944
Gross loans			105,969	110,967
Charge offs	(749)	(376)
Recoveries	273	208
Provision	383	(655)
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	450	35
Ending balance	770	450
ALLL:
Allowance for credit losses: individually evaluated for impairment			13	15
Allowance for credit losses: collectively evaluated for impairment			757	435
Allowance for credit losses	450	450	770	450
Gross loans:
Loans, individually evaluated for impairment			32	35
Loans, collectively evaluated for impairment			49,841	35,337
Gross loans			49,873	35,372
Charge offs	(499)	(2)
Provision	819	417
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	322	1,803
Ending balance	556	322
ALLL:
Allowance for credit losses: collectively evaluated for impairment			556	322
Allowance for credit losses	322	322	$ 556	$ 322
Gross loans:
Provision	$ 234	$ (1,481)