Note 7 - Loans and the Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans	$ 2,991,355	$ 1,710,265
Pass [Member]
Loans	2,916,507	1,660,185
Special Mention [Member]
Loans	43,776	27,887
Substandard [Member]
Loans	17,170	13,216
Doubtful [Member]
Loans	13,902	8,977
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Loans	403,065	244,181
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Pass [Member]
Loans	400,027	241,519
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Special Mention [Member]
Loans	912	1,141
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Substandard [Member]
Loans	1,202	1,124
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Doubtful [Member]
Loans	924	397
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member]
Loans	55,883	48,681
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Pass [Member]
Loans	53,874	46,591
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Special Mention [Member]
Loans	1,642	1,737
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Substandard [Member]
Loans	0	14
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Doubtful [Member]
Loans	367	339
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Loans	971,603	612,608
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Pass [Member]
Loans	949,245	594,046
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Special Mention [Member]
Loans	12,810	11,077
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Substandard [Member]
Loans	3,473	3,830
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Doubtful [Member]
Loans	6,075	3,655
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member]
Loans	468,650	293,142
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Pass [Member]
Loans	450,702	284,381
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Special Mention [Member]
Loans	9,290	3,175
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Substandard [Member]
Loans	4,913	3,237
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Doubtful [Member]
Loans	3,745	2,349
Residential Portfolio Segment [Member] | Multi-family Residential [Member]
Loans	95,707	36,454
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Pass [Member]
Loans	95,359	36,422
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Special Mention [Member]
Loans	320	0
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Substandard [Member]
Loans	28	32
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Doubtful [Member]
Loans	0	0
Commercial Portfolio Segment [Member]
Loans	886,325	390,398
Commercial Portfolio Segment [Member] | Pass [Member]
Loans	859,851	374,500
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans	16,832	9,219
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans	7,325	4,854
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans	2,317	1,825
Consumer Portfolio Segment [Member]
Loans	110,122	84,801
Consumer Portfolio Segment [Member] | Pass [Member]
Loans	107,449	82,726
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans	1,970	1,538
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans	229	125
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans	$ 474	$ 412