Note 4 - Loans and Allowance for Loan Losses - Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Loans past due	$ 16,810	$ 13,638
Loans, current	758,276	759,136
Loans	775,086	772,774
Residential Portfolio Segment [Member]
Loans past due	7,108	7,111
Loans, current	300,771	303,142
Loans	307,879	310,253
Commercial Real Estate Portfolio Segment [Member]
Loans	227,548	222,136
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans past due	2,264	586
Loans, current	53,251	55,239
Loans	55,515	55,825
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans past due	2,058	709
Loans, current	135,083	130,689
Loans	137,141	131,398
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans past due	120	254
Loans, current	34,772	34,659
Loans	34,892	34,913
Commercial and Industrial Portfolio Segment [Member]
Loans past due	2,060	1,873
Loans, current	100,510	98,150
Loans	102,570	100,023
Consumer Portfolio Segment [Member]
Loans	137,089	140,362
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due	1,665	1,561
Loans, current	60,064	62,209
Loans	61,729	63,770
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loans past due	547	403
Loans, current	21,347	22,479
Loans	21,894	22,882
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due	988	1,141
Loans, current	52,478	52,569
Loans	53,466	53,710
Financial Asset, 30 to 59 Days Past Due [Member]
Loans past due	9,177	7,567
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans past due	3,499	4,015
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans past due	1,951	383
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans past due	1,457	12
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans past due	52	186
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans past due	287	1,320
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due	1,200	986
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loans past due	212	106
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due	519	559
Financial Asset, 60 to 89 Days Past Due [Member]
Loans past due	1,760	2,190
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans past due	1,153	1,314
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans past due		59
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans past due
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans past due		19
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans past due	47	312
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due	275	329
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loans past due	80	18
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due	205	139
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans past due	5,873	3,881
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member]
Loans past due	2,456	1,782
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member]
Loans past due	313	144
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member]
Loans past due	601	697
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans past due	68	49
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial Portfolio Segment [Member]
Loans past due	1,726	241
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans past due	190	246
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Loans past due	255	279
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans past due	$ 264	$ 443