Note 4 - Loans - Internal Risk Rating by Loan Class (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Gross loans	$ 1,052,245	$ 1,032,903
Commercial Portfolio Segment [Member]
Gross loans	138,870	141,197
Commercial Real Estate Portfolio Segment [Member]
Gross loans	765,765	739,583
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	34,394	26,830
Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	514,052	493,920
Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	217,319	218,833
Residential Portfolio Segment [Member]
Gross loans	117,689	118,799
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	31,998	33,039
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	62,533	63,661
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	23,158	22,099
Consumer Portfolio Segment [Member]
Gross loans	29,921	33,324
Pass [Member]
Gross loans	974,439	948,864
Pass [Member] | Commercial Portfolio Segment [Member]
Gross loans	121,692	125,222
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	34,376	26,810
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	481,281	454,493
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	195,457	195,950
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	27,955	28,609
Pass [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	60,724	62,485
Pass [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	23,072	22,012
Pass [Member] | Consumer Portfolio Segment [Member]
Gross loans	29,882	33,283
Watch [Member]
Gross loans	56,198	56,105
Watch [Member] | Commercial Portfolio Segment [Member]
Gross loans	15,166	14,974
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	18	20
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Non-owner Occupied [Member]
Gross loans	31,265	32,902
Watch [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	9,517	7,224
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	232	985
Watch [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans
Watch [Member] | Consumer Portfolio Segment [Member]
Gross loans
Special Mention [Member]
Gross loans	2,955	7,477
Special Mention [Member] | Commercial Portfolio Segment [Member]
Gross loans	1,875	833
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	409	5,424
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans		1,220
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	671
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	18,653	20,457
Substandard [Member] | Commercial Portfolio Segment [Member]
Gross loans	137	168
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	1,097	1,101
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Owner Occupied Loan [Member]
Gross loans	12,345	14,439
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Individual Tax Identification Number Loan [Member]
Gross loans	4,043	4,430
Substandard [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Mortgage Receivable [Member]
Gross loans	906	191
Substandard [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Gross loans	86	87
Substandard [Member] | Consumer Portfolio Segment [Member]
Gross loans	39	41
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