Note 4 - Loans - Segregated by Class of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Loans	$ 958,723	$ 782,027	$ 779,443
Financial Asset Originated [Member]
Loans	826,309	763,640
Financial Assets Acquired [Member]
Loans	132,414	18,387
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member]
Loans	76,232	57,410	47,292
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] | Financial Asset Originated [Member]
Loans	52,085	50,181
Commercial and Agricultural Portfolio Segment [Member] | Commercial [Member] | Financial Assets Acquired [Member]
Loans	24,147	7,229
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member]
Loans	20,741	16,799	21,415
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] | Financial Asset Originated [Member]
Loans	20,462	15,993
Commercial and Agricultural Portfolio Segment [Member] | Agricultural [Member] | Financial Assets Acquired [Member]
Loans	279	806
Real Estate Portfolio Segment [Member] | Commercial [Member]
Loans	450,700	373,534	349,408
Real Estate Portfolio Segment [Member] | Commercial [Member] | Financial Asset Originated [Member]
Loans	392,681	366,792
Real Estate Portfolio Segment [Member] | Commercial [Member] | Financial Assets Acquired [Member]
Loans	58,019	6,742
Real Estate Portfolio Segment [Member] | Commercial Construction [Member]
Loans	74,000	47,849	53,570
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Financial Asset Originated [Member]
Loans	64,280	46,609
Real Estate Portfolio Segment [Member] | Commercial Construction [Member] | Financial Assets Acquired [Member]
Loans	9,720	1,240
Real Estate Portfolio Segment [Member] | Residential Construction [Member]
Loans	20,039	12,500	12,897
Real Estate Portfolio Segment [Member] | Residential Construction [Member] | Financial Asset Originated [Member]
Loans	15,080	12,242
Real Estate Portfolio Segment [Member] | Residential Construction [Member] | Financial Assets Acquired [Member]
Loans	4,959	258
Real Estate Portfolio Segment [Member] | Residential [Member]
Loans	198,654	187,714	189,153
Real Estate Portfolio Segment [Member] | Residential [Member] | Financial Asset Originated [Member]
Loans	172,853	185,699
Real Estate Portfolio Segment [Member] | Residential [Member] | Financial Assets Acquired [Member]
Loans	25,801	2,015
Real Estate Portfolio Segment [Member] | Farmland [Member]
Loans	74,341	62,709	70,069
Real Estate Portfolio Segment [Member] | Farmland [Member] | Financial Asset Originated [Member]
Loans	71,206	62,674
Real Estate Portfolio Segment [Member] | Farmland [Member] | Financial Assets Acquired [Member]
Loans	3,135	35
Consumer and Other Portfolio Segment [Member] | Consumer [Member]
Loans	22,756	18,485	18,623
Consumer and Other Portfolio Segment [Member] | Consumer [Member] | Financial Asset Originated [Member]
Loans	18,071	18,423
Consumer and Other Portfolio Segment [Member] | Consumer [Member] | Financial Assets Acquired [Member]
Loans	4,685	62
Consumer and Other Portfolio Segment [Member] | Other [Member]
Loans	21,260	5,027	$ 17,016
Consumer and Other Portfolio Segment [Member] | Other [Member] | Financial Asset Originated [Member]
Loans	19,591	5,027
Consumer and Other Portfolio Segment [Member] | Other [Member] | Financial Assets Acquired [Member]
Loans	$ 1,669