Note 4 - Loans - Internal Risk Rating by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Gross loans	$ 1,034,606	$ 946,251
Commercial Portfolio Segment [Member]
Gross loans	149,575	135,543
Commercial Real Estate Portfolio Segment [Member]
Gross loans	708,482	660,893
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	30,335	22,563
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	469,048	433,708
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	209,099	204,622
Residential Portfolio Segment [Member]
Gross loans	130,399	98,770
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	36,145	37,446
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	68,092	34,366
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	26,162	26,958
Consumer Portfolio Segment [Member]
Gross loans	46,150	51,045
Pass [Member]
Gross loans	974,951	871,038
Pass [Member] | Commercial Portfolio Segment [Member]
Gross loans	136,434	118,643
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	30,312	22,539
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	445,151	409,157
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	194,043	179,154
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	30,674	31,805
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	66,350	33,388
Pass [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	25,865	25,336
Pass [Member] | Consumer Portfolio Segment [Member]
Gross loans	46,122	51,016
Watch [Member]
Gross loans	26,944	53,150
Watch [Member] | Commercial Portfolio Segment [Member]
Gross loans	10,297	15,247
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	23	24
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	10,729	21,698
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	4,706	14,075
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	1,083	793
Watch [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	106	1,313
Watch [Member] | Consumer Portfolio Segment [Member]
Gross loans
Special Mention [Member]
Gross loans	1,018
Special Mention [Member] | Commercial Portfolio Segment [Member]
Gross loans	541
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
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans
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	477
Special Mention [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans
Special Mention [Member] | Consumer Portfolio Segment [Member]
Gross loans
Substandard [Member]
Gross loans	31,693	22,063
Substandard [Member] | Commercial Portfolio Segment [Member]
Gross loans	2,303	1,653
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	13,168	2,853
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	10,350	11,393
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	5,471	5,641
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	182	185
Substandard [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	191	309
Substandard [Member] | Consumer Portfolio Segment [Member]
Gross loans	28	29
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