Note 6 - Loans and Related Allowance for Loan Loss - Loans Summarized by Individually Evaluated for Impairment and Collectively Evaluated for Potential Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Individually Evaluated for Impairment	$ 9,769	$ 7,881
Collectively Evaluated for Potential Impairment	926,119	904,991
Loans and Leases Receivable, Gross, Total	935,888	912,872
Originated Loans [Member]
Individually Evaluated for Impairment	6,937	4,143
Collectively Evaluated for Potential Impairment	749,930	717,448
Loans and Leases Receivable, Gross, Total	756,867	721,591
Acquired Loans [Member]
Individually Evaluated for Impairment	2,832	3,738
Collectively Evaluated for Potential Impairment	176,189	187,543
Loans and Leases Receivable, Gross, Total	179,021	191,281
Residential Portfolio Segment [Member] | Real Estate Sector [Member]
Individually Evaluated for Impairment	497	1,283
Collectively Evaluated for Potential Impairment	330,368	325,486
Loans and Leases Receivable, Gross, Total	330,865	326,769
Residential Portfolio Segment [Member] | Real Estate Sector [Member] | Originated Loans [Member]
Individually Evaluated for Impairment	146	71
Collectively Evaluated for Potential Impairment	246,817	235,421
Loans and Leases Receivable, Gross, Total	246,963	235,492
Residential Portfolio Segment [Member] | Real Estate Sector [Member] | Acquired Loans [Member]
Individually Evaluated for Impairment	351	1,212
Collectively Evaluated for Potential Impairment	83,551	90,065
Loans and Leases Receivable, Gross, Total	83,902	91,277
Commercial Portfolio Segment [Member] | Real Estate Sector [Member]
Individually Evaluated for Impairment	7,813	4,734
Collectively Evaluated for Potential Impairment	309,369	302,330
Loans and Leases Receivable, Gross, Total	317,182	307,064
Commercial Portfolio Segment [Member] | Real Estate Sector [Member] | Originated Loans [Member]
Individually Evaluated for Impairment	5,348	2,224
Collectively Evaluated for Potential Impairment	242,323	227,231
Loans and Leases Receivable, Gross, Total	247,671	229,455
Commercial Portfolio Segment [Member] | Real Estate Sector [Member] | Acquired Loans [Member]
Individually Evaluated for Impairment	2,465	2,510
Collectively Evaluated for Potential Impairment	67,046	75,099
Loans and Leases Receivable, Gross, Total	69,511	77,609
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Individually Evaluated for Impairment	1,163	1,464
Collectively Evaluated for Potential Impairment	92,687	89,999
Loans and Leases Receivable, Gross, Total	93,850	91,463
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Originated Loans [Member]
Individually Evaluated for Impairment	1,147	1,448
Collectively Evaluated for Potential Impairment	77,893	77,018
Loans and Leases Receivable, Gross, Total	79,040	78,466
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Acquired Loans [Member]
Individually Evaluated for Impairment	16	16
Collectively Evaluated for Potential Impairment	14,794	12,981
Loans and Leases Receivable, Gross, Total	14,810	12,997
Construction Portfolio Segment [Member] | Real Estate Sector [Member]
Individually Evaluated for Impairment	296	400
Collectively Evaluated for Potential Impairment	60,119	48,424
Loans and Leases Receivable, Gross, Total	60,415	48,824
Construction Portfolio Segment [Member] | Real Estate Sector [Member] | Originated Loans [Member]
Individually Evaluated for Impairment	296	400
Collectively Evaluated for Potential Impairment	55,758	46,424
Loans and Leases Receivable, Gross, Total	56,054	46,824
Construction Portfolio Segment [Member] | Real Estate Sector [Member] | Acquired Loans [Member]
Individually Evaluated for Impairment
Collectively Evaluated for Potential Impairment	4,361	2,000
Loans and Leases Receivable, Gross, Total	4,361	2,000
Consumer Portfolio Segment [Member]
Individually Evaluated for Impairment
Collectively Evaluated for Potential Impairment	116,727	122,241
Loans and Leases Receivable, Gross, Total	116,727	122,241
Consumer Portfolio Segment [Member] | Originated Loans [Member]
Individually Evaluated for Impairment
Collectively Evaluated for Potential Impairment	114,897	119,731
Loans and Leases Receivable, Gross, Total	114,897	119,731
Consumer Portfolio Segment [Member] | Acquired Loans [Member]
Individually Evaluated for Impairment
Collectively Evaluated for Potential Impairment	1,830	2,510
Loans and Leases Receivable, Gross, Total	1,830	2,510
Other Portfolio Segment [Member]
Individually Evaluated for Impairment
Collectively Evaluated for Potential Impairment	16,849	16,511
Loans and Leases Receivable, Gross, Total	16,849	16,511
Other Portfolio Segment [Member] | Originated Loans [Member]
Individually Evaluated for Impairment
Collectively Evaluated for Potential Impairment	12,242	11,623
Loans and Leases Receivable, Gross, Total	12,242	11,623
Other Portfolio Segment [Member] | Acquired Loans [Member]
Individually Evaluated for Impairment
Collectively Evaluated for Potential Impairment	4,607	4,888
Loans and Leases Receivable, Gross, Total	$ 4,607	$ 4,888