Note 7 - Loans and the Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans	$ 1,710,265	$ 1,528,469
Pass [Member]
Loans	1,660,185	1,474,420
Special Mention [Member]
Loans	27,887	26,763
Substandard [Member]
Loans	13,216	15,595
Doubtful [Member]
Loans	8,977	11,691
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Loans	244,181	211,054
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Pass [Member]
Loans	241,519	209,027
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Special Mention [Member]
Loans	1,141	718
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Substandard [Member]
Loans	1,124	1,277
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Doubtful [Member]
Loans	397	32
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member]
Loans	48,681	45,989
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Pass [Member]
Loans	46,591	45,563
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Special Mention [Member]
Loans	1,737	153
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Substandard [Member]
Loans	14	161
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Doubtful [Member]
Loans	339	112
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Loans	612,608	518,660
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Pass [Member]
Loans	594,046	494,698
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Special Mention [Member]
Loans	11,077	14,421
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Substandard [Member]
Loans	3,830	3,510
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Doubtful [Member]
Loans	3,655	6,031
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member]
Loans	293,142	270,583
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Pass [Member]
Loans	284,381	260,325
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Special Mention [Member]
Loans	3,175	4,601
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Substandard [Member]
Loans	3,237	2,929
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Doubtful [Member]
Loans	2,349	2,728
Residential Portfolio Segment [Member] | Multi-family Residential [Member]
Loans	36,454	39,273
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Pass [Member]
Loans	36,422	39,237
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Special Mention [Member]
Loans	0	0
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Substandard [Member]
Loans	32	36
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Doubtful [Member]
Loans	0	0
Commercial Portfolio Segment [Member]
Loans	390,398	363,640
Commercial Portfolio Segment [Member] | Pass [Member]
Loans	374,500	347,839
Commercial Portfolio Segment [Member] | Special Mention [Member]
Loans	9,219	5,690
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans	4,854	7,448
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans	1,825	2,663
Consumer Portfolio Segment [Member]
Loans	84,801	79,270
Consumer Portfolio Segment [Member] | Pass [Member]
Loans	82,726	77,731
Consumer Portfolio Segment [Member] | Special Mention [Member]
Loans	1,538	1,180
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans	125	234
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans	$ 412	$ 125