Note 4 - Loans - Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Loans	$ 935,271	$ 782,027	$ 766,796
Financial Asset Originated [Member]
Loans	796,045	763,640
Financial Assets Acquired [Member]
Loans	139,226	18,387
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]
Loans	68,535	57,410	45,029
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] | Financial Asset Originated [Member]
Loans	43,561	50,181
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] | Financial Assets Acquired [Member]
Loans	24,974	7,229
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]
Loans	18,861	16,799	20,037
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] | Financial Asset Originated [Member]
Loans	18,561	15,993
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] | Financial Assets Acquired [Member]
Loans	300	806
Real Estate Portfolio Segment [Member] | Commercial [Member]
Loans	433,816	373,534	352,063
Real Estate Portfolio Segment [Member] | Commercial [Member] | Financial Asset Originated [Member]
Loans	376,063	366,792
Real Estate Portfolio Segment [Member] | Commercial [Member] | Financial Assets Acquired [Member]
Loans	57,753	6,742
Real Estate Portfolio Segment [Member] | Commercial Construction [Member]
Loans	72,978	47,849	48,909
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Financial Asset Originated [Member]
Loans	60,949	46,609
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Financial Assets Acquired [Member]
Loans	12,029	1,240
Real Estate Portfolio Segment [Member] | Residential Construction [Member]
Loans	18,622	12,500	11,541
Real Estate Portfolio Segment [Member] | Residential Construction [Member] | Financial Asset Originated [Member]
Loans	13,193	12,242
Real Estate Portfolio Segment [Member] | Residential Construction [Member] | Financial Assets Acquired [Member]
Loans	5,429	258
Real Estate Portfolio Segment [Member] | Residential [Member]
Loans	205,188	187,714	187,591
Real Estate Portfolio Segment [Member] | Residential [Member] | Financial Asset Originated [Member]
Loans	177,183	185,699
Real Estate Portfolio Segment [Member] | Residential [Member] | Financial Assets Acquired [Member]
Loans	28,005	2,015
Real Estate Portfolio Segment [Member] | Farmland [Member]
Loans	74,272	62,709	67,867
Real Estate Portfolio Segment [Member] | Farmland [Member] | Financial Asset Originated [Member]
Loans	70,413	62,674
Real Estate Portfolio Segment [Member] | Farmland [Member] | Financial Assets Acquired [Member]
Loans	3,859	35
Consumer and Other Portfolio Segment [Member] | Consumer [Member]
Loans	23,066	18,485	18,746
Consumer and Other Portfolio Segment [Member] | Consumer [Member] | Financial Asset Originated [Member]
Loans	17,860	18,423
Consumer and Other Portfolio Segment [Member] | Consumer [Member] | Financial Assets Acquired [Member]
Loans	5,206	62
Consumer and Other Portfolio Segment [Member] | Other [Member]
Loans	19,933	5,027	$ 15,013
Consumer and Other Portfolio Segment [Member] | Other [Member] | Financial Asset Originated [Member]
Loans	18,262	5,027
Consumer and Other Portfolio Segment [Member] | Other [Member] | Financial Assets Acquired [Member]
Loans	$ 1,671