Note 6 - Loans (Details) - Age Analysis of Past Due Loans - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	$ 13,443	$ 18,652
Loans, current	705,090	642,246
Gross loans	718,533	660,898
Recorded investment greater than 90 days and accruing	52	23
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	2,809	3,804
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	809	579
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	9,825	14,269
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	1,123	4,883
Loans, current	143,626	145,370
Gross loans	144,749	150,253
Commercial Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	346	2,421
Commercial Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	171	301
Commercial 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	606	2,161
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	419,060	364,306
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, current	29,701	30,099
Gross loans	29,701	30,099
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	6,592	7,086
Loans, current	231,005	206,797
Gross loans	237,597	213,883
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	1,262
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	5,330	7,086
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	1,943	1,378
Loans, current	149,819	118,946
Gross loans	151,762	120,324
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	15
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	1,928	1,378
Commercial Real Estate Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans		52,830
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	108,080	110,967
Residential Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	237,597
Residential Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Gross loans	151,762
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	203	268
Loans, current	45,530	44,713
Gross loans	45,733	44,981
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	82	145
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	98	99
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	23	24
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	2,296	3,219
Loans, current	47,866	49,611
Gross loans	50,162	52,830
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	971	1,080
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	104	122
Residential Portfolio Segment [Member] | Individual Tax Identification Number Loan [Member] | Real Estate Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	1,221	2,017
Residential Portfolio Segment [Member] | Mortgage Receivable [Member] | Real Estate Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	1,059	1,580
Loans, current	11,126	11,576
Gross loans	12,185	13,156
Residential Portfolio Segment [Member] | Mortgage Receivable [Member] | Real Estate Loan [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	394
Residential Portfolio Segment [Member] | Mortgage Receivable [Member] | Real Estate Loan [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	665	1,580
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	227	238
Loans, current	46,417	35,134
Gross loans	46,644	35,372
Recorded investment greater than 90 days and accruing	52	23
Consumer Portfolio Segment [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	133	158
Consumer Portfolio Segment [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, past due	42	57
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	$ 52	$ 23