Note 3 - Loans - Risk Category of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Gross loans	$ 961,561	$ 926,271
Pass [Member]
Gross loans	915,985	888,707
Watch [Member]
Gross loans	38,464	27,522
Special Mention [Member]
Gross loans	0
Substandard [Member]
Gross loans	7,112	10,042
Doubtful [Member]
Gross loans	0	0
Commercial Portfolio Segment [Member]
Gross loans	169,176	145,551
Commercial Portfolio Segment [Member] | Pass [Member]
Gross loans	146,310	130,312
Commercial Portfolio Segment [Member] | Watch [Member]
Gross loans	20,903	11,280
Commercial Portfolio Segment [Member] | Special Mention [Member]
Gross loans	0	0
Commercial Portfolio Segment [Member] | Substandard [Member]
Gross loans	1,963	3,959
Commercial Portfolio Segment [Member] | Doubtful [Member]
Gross loans	0	0
Commercial Real Estate Portfolio Segment [Member]
Gross loans	413,653	399,488
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Gross loans	71,267	64,911
Commercial Real Estate Portfolio Segment [Member] | Farmland Loans [Member]
Gross loans	80,579	79,118
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Gross loans	261,807	255,459
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Construction Loans [Member]
Gross loans	71,267	64,911
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Farmland Loans [Member]
Gross loans	73,202	71,503
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Nonfarm Nonresidential [Member]
Gross loans	252,982	245,995
Commercial Real Estate Portfolio Segment [Member] | Watch [Member] | Construction Loans [Member]
Gross loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Watch [Member] | Farmland Loans [Member]
Gross loans	6,568	6,663
Commercial Real Estate Portfolio Segment [Member] | Watch [Member] | Nonfarm Nonresidential [Member]
Gross loans	7,152	6,986
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Construction Loans [Member]
Gross loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Farmland Loans [Member]
Gross loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Nonfarm Nonresidential [Member]
Gross loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Construction Loans [Member]
Gross loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Farmland Loans [Member]
Gross loans	809	952
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Nonfarm Nonresidential [Member]
Gross loans	1,673	2,478
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Construction Loans [Member]
Gross loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Farmland Loans [Member]
Gross loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Nonfarm Nonresidential [Member]
Gross loans	0	0
Residential Portfolio Segment [Member]
Gross loans	296,226	297,579
Residential Portfolio Segment [Member] | Multifamily Loans [Member]
Gross loans	75,525	70,950
Residential Portfolio Segment [Member] | One- to Four-family Residential Properties [Member]
Gross loans	220,701	226,629
Residential Portfolio Segment [Member] | Pass [Member] | Multifamily Loans [Member]
Gross loans	75,525	70,950
Residential Portfolio Segment [Member] | Pass [Member] | One- to Four-family Residential Properties [Member]
Gross loans	214,559	221,727
Residential Portfolio Segment [Member] | Watch [Member] | Multifamily Loans [Member]
Gross loans	0
Residential Portfolio Segment [Member] | Watch [Member] | One- to Four-family Residential Properties [Member]
Gross loans	3,683	2,420
Residential Portfolio Segment [Member] | Special Mention [Member] | Multifamily Loans [Member]
Gross loans	0	0
Residential Portfolio Segment [Member] | Special Mention [Member] | One- to Four-family Residential Properties [Member]
Gross loans	0
Residential Portfolio Segment [Member] | Substandard [Member] | Multifamily Loans [Member]
Gross loans	0	0
Residential Portfolio Segment [Member] | Substandard [Member] | One- to Four-family Residential Properties [Member]
Gross loans	2,459	2,482
Residential Portfolio Segment [Member] | Doubtful [Member] | Multifamily Loans [Member]
Gross loans	0	0
Residential Portfolio Segment [Member] | Doubtful [Member] | One- to Four-family Residential Properties [Member]
Gross loans	0	0
Consumer Portfolio Segment [Member]
Gross loans	44,814	47,790
Consumer Portfolio Segment [Member] | Pass [Member]
Gross loans	44,640	47,657
Consumer Portfolio Segment [Member] | Watch [Member]
Gross loans	3	5
Consumer Portfolio Segment [Member] | Special Mention [Member]
Gross loans	0	0
Consumer Portfolio Segment [Member] | Substandard [Member]
Gross loans	171	128
Consumer Portfolio Segment [Member] | Doubtful [Member]
Gross loans	0	0
Agriculture Portfolio Segment [Member]
Gross loans	36,977	35,064
Agriculture Portfolio Segment [Member] | Pass [Member]
Gross loans	36,785	34,853
Agriculture Portfolio Segment [Member] | Watch [Member]
Gross loans	155	168
Agriculture Portfolio Segment [Member] | Special Mention [Member]
Gross loans	0	0
Agriculture Portfolio Segment [Member] | Substandard [Member]
Gross loans	37	43
Agriculture Portfolio Segment [Member] | Doubtful [Member]
Gross loans	0	0
Other Portfolio Segment [Member]
Gross loans	715	799
Other Portfolio Segment [Member] | Pass [Member]
Gross loans	715	799
Other Portfolio Segment [Member] | Watch [Member]
Gross loans	0	0
Other Portfolio Segment [Member] | Special Mention [Member]
Gross loans	0	0
Other Portfolio Segment [Member] | Substandard [Member]
Gross loans	0	0
Other Portfolio Segment [Member] | Doubtful [Member]
Gross loans	$ 0	$ 0