Note 5 - Loans - Internal Risk Rating by Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Pass [Member] | Commercial Portfolio Segment [Member]
Gross loans	$ 113,413	$ 108,696
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	47,834	28,291
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	276,775	234,177
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	152,098	149,327
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	39,149	41,480
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	8,459	9,041
Pass [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	39,170	41,149
Pass [Member] | Consumer Portfolio Segment [Member]
Gross loans	52,079	49,551
Pass [Member]
Gross loans	728,977	661,712
Watch [Member] | Commercial Portfolio Segment [Member]
Gross loans	10,871	10,240
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	531	28
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	880	917
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	6,555	3,864
Watch [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans
Watch [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	514
Watch [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	1,578	1,760
Watch [Member] | Consumer Portfolio Segment [Member]
Gross loans	3
Watch [Member]
Gross loans	20,932	16,809
Special Mention [Member] | Commercial Portfolio Segment [Member]
Gross loans	7,850	9,587
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	1,336	1,588
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	499	1,687
Special Mention [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans
Special Mention [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans		575
Special Mention [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	43	1,682
Special Mention [Member] | Consumer Portfolio Segment [Member]
Gross loans		256
Special Mention [Member]
Gross loans	9,728	15,375
Substandard [Member] | Commercial Portfolio Segment [Member]
Gross loans	4,101	4,282
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	2,986	6,692
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	1,322	1,421
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	7,309	7,626
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	1,797	1,774
Substandard [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	1,572	882
Substandard [Member] | Consumer Portfolio Segment [Member]
Gross loans	295	66
Substandard [Member]
Gross loans	19,382	22,743
Doubtful [Member] | Commercial Portfolio Segment [Member]
Gross loans
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans
Doubtful [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans
Doubtful [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans
Doubtful [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans
Doubtful [Member] | Consumer Portfolio Segment [Member]
Gross loans
Doubtful [Member]
Gross loans
Commercial Portfolio Segment [Member]
Gross loans	136,235	132,805
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	48,365	28,319
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	281,977	243,374
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	160,474	156,299
Commercial Real Estate Portfolio Segment [Member]
Gross loans	490,816	427,992
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	46,458	49,106
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	10,770	11,390
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	42,363	45,473
Residential Portfolio Segment [Member]
Gross loans	99,591	105,969
Consumer Portfolio Segment [Member]
Gross loans	52,377	49,873
Gross loans	$ 779,019	$ 716,639