Note 4 - Loans - Internal Risk Rating by Loan Class (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Gross loans	$ 824,874	$ 804,211
Commercial Portfolio Segment [Member]
Gross loans	147,212	153,844
Commercial Real Estate Portfolio Segment [Member]
Gross loans	531,890	496,742
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	14,700	36,792
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	333,766	292,615
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	183,424	167,335
Residential Portfolio Segment [Member]
Gross loans	94,340	101,944
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	42,063	45,566
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	21,119	20,425
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	31,158	35,953
Consumer Portfolio Segment [Member]
Gross loans	51,432	51,681
Pass [Member]
Gross loans	755,755	743,235
Pass [Member] | Commercial Portfolio Segment [Member]
Gross loans	112,623	124,089
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	14,700	36,782
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	322,650	284,099
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	171,315	157,064
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	35,480	38,279
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	19,696	17,696
Pass [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	27,922	33,828
Pass [Member] | Consumer Portfolio Segment [Member]
Gross loans	51,369	51,398
Watch [Member]
Gross loans	49,591	36,068
Watch [Member] | Commercial Portfolio Segment [Member]
Gross loans	27,420	21,684
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans		10
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	9,332	5,398
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	10,027	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	797	815
Watch [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	2,015	858
Watch [Member] | Consumer Portfolio Segment [Member]
Gross loans		2
Special Mention [Member]
Gross loans	3,238	6,387
Special Mention [Member] | Commercial Portfolio Segment [Member]
Gross loans	2,633	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	395	1,321
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	142	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	65
Special Mention [Member] | Consumer Portfolio Segment [Member]
Gross loans	3
Substandard [Member]
Gross loans	16,290	18,521
Substandard [Member] | Commercial Portfolio Segment [Member]
Gross loans	4,536	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	1,389	1,797
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	1,940	2,474
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	6,583	7,287
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	626	1,914
Substandard [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	1,156	1,267
Substandard [Member] | Consumer Portfolio Segment [Member]
Gross loans	60	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