Note 6 - Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans, Evaluated for Impairment Excluding PCI Loans, by Loan Class (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans individually evaluated for impairment	$ 8,049	$ 6,535
Allowance for loans individually evaluated	427	645
Loans collectively evaluated for impairment	2,138,921	1,672,634
Allowance for loans collectively evaluated	25,754	17,780
Commercial Portfolio Segment [Member]
Loans individually evaluated for impairment	6,376	3,519
Allowance for loans individually evaluated	319	292
Loans collectively evaluated for impairment	1,252,765	969,838
Allowance for loans collectively evaluated	14,341	9,943
Commercial Portfolio Segment [Member] | Construction, Development and Other Land [Member]
Loans individually evaluated for impairment	0	0
Allowance for loans individually evaluated	0	0
Loans collectively evaluated for impairment	43,716	30,334
Allowance for loans collectively evaluated	528	245
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans individually evaluated for impairment	724	0
Allowance for loans individually evaluated	0	0
Loans collectively evaluated for impairment	171,486	95,659
Allowance for loans collectively evaluated	1,024	699
Commercial Portfolio Segment [Member] | Multi-family Residential [Member]
Loans individually evaluated for impairment	695	944
Allowance for loans individually evaluated	0	0
Loans collectively evaluated for impairment	112,852	98,201
Allowance for loans collectively evaluated	1,417	969
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Loans individually evaluated for impairment	1,041	0
Allowance for loans individually evaluated	0	0
Loans collectively evaluated for impairment	183,283	128,520
Allowance for loans collectively evaluated	1,861	1,323
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Loans individually evaluated for impairment	3,916	2,575
Allowance for loans individually evaluated	319	292
Loans collectively evaluated for impairment	714,160	591,520
Allowance for loans collectively evaluated	9,097	6,361
Commercial Portfolio Segment [Member] | Agricultural [Member]
Loans individually evaluated for impairment	0	0
Allowance for loans individually evaluated	0	0
Loans collectively evaluated for impairment	9,728	9,458
Allowance for loans collectively evaluated	218	145
Commercial Portfolio Segment [Member] | Farmland [Member]
Loans individually evaluated for impairment	0	0
Allowance for loans individually evaluated	0	0
Loans collectively evaluated for impairment	17,540	16,146
Allowance for loans collectively evaluated	196	201
Consumer Real Estate Portfolio Segment [Member]
Loans individually evaluated for impairment	1,673	3,016
Allowance for loans individually evaluated	108	353
Loans collectively evaluated for impairment	760,372	598,855
Allowance for loans collectively evaluated	8,843	5,972
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Loans individually evaluated for impairment	0	0
Allowance for loans individually evaluated	0	0
Loans collectively evaluated for impairment	95,765	91,999
Allowance for loans collectively evaluated	799	673
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Loans individually evaluated for impairment	1,673	3,016
Allowance for loans individually evaluated	108	353
Loans collectively evaluated for impairment	647,040	490,712
Allowance for loans collectively evaluated	7,849	5,175
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Loans individually evaluated for impairment	0	0
Allowance for loans individually evaluated	0	0
Loans collectively evaluated for impairment	17,567	16,144
Allowance for loans collectively evaluated	195	124
Consumer and Other Portfolio Segment [Member]
Loans individually evaluated for impairment	0	0
Allowance for loans individually evaluated	0	0
Loans collectively evaluated for impairment	125,784	103,941
Allowance for loans collectively evaluated	2,570	1,865
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Loans individually evaluated for impairment	0	0
Allowance for loans individually evaluated	0	0
Loans collectively evaluated for impairment	119,770	99,199
Allowance for loans collectively evaluated	2,570	1,865
Consumer and Other Portfolio Segment [Member] | Other Loan [Member]
Loans individually evaluated for impairment	0	0
Allowance for loans individually evaluated	0	0
Loans collectively evaluated for impairment	6,014	4,742
Allowance for loans collectively evaluated	$ 0	$ 0