Note 5 - Loans - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans, past due	$ 75
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans, past due
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Loans, past due		64
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Loans, past due
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Loans, past due	411	1,018
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Loans, past due	163
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Loans, past due	335	137
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans, past due	145	150
Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, past due	1,129	1,369
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans, past due		30
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans, past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Loans, past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Loans, past due
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Loans, past due		118
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Loans, past due	414	404
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Loans, past due	37	97
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans, past due	51	50
Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, past due	502	699
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans, past due	355	634
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans, past due
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Loans, past due	1,197	5,665
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Loans, past due	113	1,071
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Loans, past due	1,010	850
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Loans, past due	665	871
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Loans, past due	43
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member]
Loans, past due	10	88
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, past due	3,393	9,179
Commercial Portfolio Segment [Member]
Loans, past due	430	664
Loans, current	149,980	132,141
Gross loans	150,410	132,805
Consumer and other
Recorded investment greater than 90 days and accruing
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans, past due
Loans, current	39,009	28,319
Gross loans	39,009	28,319
Consumer and other
Recorded investment greater than 90 days and accruing
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Loans, past due	1,197	5,729
Loans, current	252,676	237,645
Gross loans	253,873	243,374
Consumer and other
Recorded investment greater than 90 days and accruing
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Loans, past due	113	1,071
Loans, current	154,367	155,228
Gross loans	154,480	156,299
Consumer and other
Recorded investment greater than 90 days and accruing
Commercial Real Estate Portfolio Segment [Member]
Gross loans	447,362	427,992
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Loans, past due	1,421	1,986
Loans, current	45,767	47,120
Gross loans	47,188	49,106
Consumer and other
Recorded investment greater than 90 days and accruing
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Loans, past due	1,242	1,275
Loans, current	9,620	10,115
Gross loans	10,862	11,390
Consumer and other
Recorded investment greater than 90 days and accruing
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Loans, past due	415	234
Loans, current	43,556	45,239
Gross loans	43,971	45,473
Consumer and other
Recorded investment greater than 90 days and accruing
Residential Portfolio Segment [Member]
Gross loans	102,021	105,969
Consumer Portfolio Segment [Member]
Loans, past due	206	288
Loans, current	54,141	49,585
Gross loans	54,347	49,873
Consumer and other	10	88
Recorded investment greater than 90 days and accruing	10	88
Loans, past due	5,024	11,247
Loans, current	749,116	705,392
Gross loans	754,140	716,639
Consumer and other	10	88
Recorded investment greater than 90 days and accruing	$ 10	$ 88