Note 5 - Loans - Internal Risk Rating by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Gross loans	$ 810,194	$ 804,211
Commercial Portfolio Segment [Member]
Gross loans	145,635	153,844
Commercial Real Estate Portfolio Segment [Member]
Gross loans	516,196	496,742
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	46,228	57,771
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	305,802	287,455
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	164,166	151,516
Residential Portfolio Segment [Member]
Gross loans	96,940	101,944
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	44,211	45,566
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	19,710	20,425
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	33,019	35,953
Consumer Portfolio Segment [Member]
Gross loans	51,423	51,681
Pass [Member]
Gross loans	729,889	743,235
Pass [Member] | Commercial Portfolio Segment [Member]
Gross loans	102,548	124,089
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	42,375	57,761
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	296,187	277,765
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	152,754	142,419
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	37,427	38,279
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	17,564	17,696
Pass [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	29,678	33,828
Pass [Member] | Consumer Portfolio Segment [Member]
Gross loans	51,356	51,398
Watch [Member]
Gross loans	56,012	36,068
Watch [Member] | Commercial Portfolio Segment [Member]
Gross loans	33,887	21,684
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	3,853	10
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	5,351	5,398
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	10,092	7,301
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	809	815
Watch [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	2,018	858
Watch [Member] | Consumer Portfolio Segment [Member]
Gross loans	2	2
Special Mention [Member]
Gross loans	7,070	6,387
Special Mention [Member] | Commercial Portfolio Segment [Member]
Gross loans	6,012	4,570
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	499	1,321
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	489	496
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
Special Mention [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	70
Special Mention [Member] | Consumer Portfolio Segment [Member]
Gross loans
Substandard [Member]
Gross loans	17,223	18,521
Substandard [Member] | Commercial Portfolio Segment [Member]
Gross loans	3,188	3,501
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	3,765	2,971
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	831	1,300
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	6,784	7,287
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	1,337	1,914
Substandard [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	1,253	1,267
Substandard [Member] | Consumer Portfolio Segment [Member]
Gross loans	65	281
Doubtful [Member]
Gross loans
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