Note 9 - Allowance for Loan Losses and Credit Quality Information (Details) - Aging of Past Due Loans - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	$ 2,988	$ 2,920
Current loans	438,039	370,636
Total loans	441,027	373,556
Loans 90 days or more past due and still accruing	0	0
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	1,484	1,099
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	628	849
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	876	972
1-4 Family Porfolio Segment[Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	1,947	1,927
Current loans	80,280	67,914
Total loans	82,227	69,841
Loans 90 days or more past due and still accruing	0	0
1-4 Family Porfolio Segment[Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	915	413
1-4 Family Porfolio Segment[Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	318	673
1-4 Family Porfolio Segment[Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	714	841
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	236,119	191,668
Commercial Real Estate Portfolio Segment [Member] | Residential Developments [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	0	0
Current loans	29,074	19,960
Total loans	29,074	19,960
Loans 90 days or more past due and still accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Residential Developments [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Residential Developments [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Residential Developments [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	0	0
Current loans	207,045	171,708
Total loans	207,045	171,708
Loans 90 days or more past due and still accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	743	857
Current loans	62,112	54,068
Total loans	62,855	54,925
Loans 90 days or more past due and still accruing	0	0
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	306	550
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	290	176
Consumer Portfolio Segment [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	147	131
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	59,826	57,122
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	0
Current loans	7,210
Total loans	7,210	7,121
Loans 90 days or more past due and still accruing	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	0
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	0
Commercial Portfolio Segment [Member] | Commercial Business Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	298	136
Current loans	52,318	49,865
Total loans	52,616	50,001
Loans 90 days or more past due and still accruing	0	0
Commercial Portfolio Segment [Member] | Commercial Business Other [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	263	136
Commercial Portfolio Segment [Member] | Commercial Business Other [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	20	0
Commercial Portfolio Segment [Member] | Commercial Business Other [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due	$ 15	0
Commercial Portfolio Segment [Member] | Construction Industry [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due		0
Current loans		7,121
Total loans		7,121
Loans 90 days or more past due and still accruing		0
Commercial Portfolio Segment [Member] | Construction Industry [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due		0
Commercial Portfolio Segment [Member] | Construction Industry [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due		0
Commercial Portfolio Segment [Member] | Construction Industry [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due		$ 0