Note 4 - Loans, Allowance for Loan Losses and Other Real Estate Owned - Credit Risk Profile by Internally Assigned Grade (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Loans	$ 1,161,712	$ 1,207,202
Pass [Member]
Loans	1,137,147	1,179,859
Substandard [Member]
Loans	24,118	26,658
Doubtful [Member]
Loans	271	135
Unlikely to be Collected Financing Receivable [Member]
Loans	176	550
Commercial Portfolio Segment [Member]
Loans	243,577	275,080
Commercial Portfolio Segment [Member] | Pass [Member]
Loans	234,053	264,634
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans	9,524	10,446
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans	0	0
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member]
Loans	577,665	580,480
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans	566,359	567,578
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans	11,306	12,902
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Construction Portfolio Segment [Member]
Loans	5,482	3,982
Construction Portfolio Segment [Member] | Pass [Member]
Loans	5,482	3,982
Construction Portfolio Segment [Member] | Substandard [Member]
Loans	0	0
Construction Portfolio Segment [Member] | Doubtful [Member]
Loans	0	0
Construction Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Residential Portfolio Segment [Member]
Loans	37,813	44,866
Residential Portfolio Segment [Member] | Pass [Member]
Loans	36,076	43,112
Residential Portfolio Segment [Member] | Substandard [Member]
Loans	1,737	1,754
Residential Portfolio Segment [Member] | Doubtful [Member]
Loans	0	0
Residential Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Consumer Portfolio Segment [Member]
Loans	297,175	302,794
Consumer Portfolio Segment [Member] | Pass [Member]
Loans	295,177	300,553
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans	1,551	1,556
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans	271	135
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	$ 176	$ 550