Note 7 - Loans and the Allowance for Loan Losses - Past Due Loans Receivable (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Loans	$ 4,606,176,000	$ 3,189,608,000
Recorded investment over 90 days past due and still accruing	335,000	222,000
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	4,879,000	2,352,000
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	2,636,000	1,376,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	6,468,000	8,279,000
Financial Asset, Past Due [Member]
Loans	13,983,000	12,007,000
Financial Asset, Not Past Due [Member]
Loans	4,592,193,000	3,177,601,000
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Loans	722,074,000	548,528,000
Recorded investment over 90 days past due and still accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	320,000	632,000
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	41,000	16,000
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	638,000	488,000
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Financial Asset, Past Due [Member]
Loans	999,000	1,136,000
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Financial Asset, Not Past Due [Member]
Loans	721,075,000	547,392,000
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member]
Loans	193,587,000	87,463,000
Recorded investment over 90 days past due and still accruing	50,000	0
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	49,000	83,000
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	50,000	0
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Financial Asset, Past Due [Member]
Loans	99,000	83,000
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member] | Financial Asset, Not Past Due [Member]
Loans	193,488,000	87,380,000
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Loans	1,826,819,000	1,144,426,000
Recorded investment over 90 days past due and still accruing	48,000	0
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	1,442,000	222,000
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	210,000	627,000
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	1,631,000	1,767,000
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Financial Asset, Past Due [Member]
Loans	3,283,000	2,616,000
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Financial Asset, Not Past Due [Member]
Loans	1,823,536,000	1,141,810,000
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member]
Loans	557,741,000	467,699,000
Recorded investment over 90 days past due and still accruing	0	107,000
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	1,590,000	917,000
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	423,000	534,000
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	1,781,000	1,496,000
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Financial Asset, Past Due [Member]
Loans	3,794,000	2,947,000
Residential Portfolio Segment [Member] | Real Estate Residential One- to Four-Family [Member] | Financial Asset, Not Past Due [Member]
Loans	553,947,000	464,752,000
Residential Portfolio Segment [Member] | Multi-family Residential [Member]
Loans	98,637,000	97,508,000
Recorded investment over 90 days past due and still accruing	0	0
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, Past Due [Member]
Loans	0	0
Residential Portfolio Segment [Member] | Multi-family Residential [Member] | Financial Asset, Not Past Due [Member]
Loans	98,637,000	97,508,000
Commercial Portfolio Segment [Member]
Loans	1,090,343,000	721,385,000
Recorded investment over 90 days past due and still accruing	222,000	97,000
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	1,035,000	106,000
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	1,919,000	55,000
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	2,069,000	4,257,000
Commercial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans	5,023,000	4,418,000
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	1,085,320,000	716,967,000
Consumer Portfolio Segment [Member]
Loans	116,975,000	122,599,000
Recorded investment over 90 days past due and still accruing	15,000	18,000
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	443,000	392,000
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	43,000	144,000
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	299,000	271,000
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Loans	785,000	807,000
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	$ 116,190,000	$ 121,792,000