Note 4 - Loans - Schedule of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Loans	$ 4,763,876		$ 3,293,544
Net deferred loan costs	12,601		11,169
Allowance for credit losses	(53,285)	$ (54,684)	(36,811)	$ (38,563)	$ (35,549)	$ (35,863)
Net loans	4,723,192		3,267,902
Commercial Real Estate Portfolio Segment [Member]
Allowance for credit losses	(28,671)	(30,049)	(20,064)	(21,627)	(19,480)	(19,259)
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied [Member]
Loans	627,421		393,061
Commercial Real Estate Portfolio Segment [Member] \| Nonowner Occupied [Member]
Loans	1,016,924		710,468
Commercial Real Estate Portfolio Segment [Member] \| Farmland [Member]
Loans	228,228		211,370
Commercial Real Estate Portfolio Segment [Member] \| Other Loans [Member]
Loans	378,388		294,587
Commercial Portfolio Segment [Member]
Allowance for credit losses	(7,950)	(8,041)	(4,536)	(4,973)	(4,383)	(4,628)
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Loans	592,431		340,224
Commercial Portfolio Segment [Member] \| Agricultural [Member]
Loans	56,799		54,195
Residential Portfolio Segment [Member]
Allowance for credit losses	(11,052)	(11,331)	(7,241)	(7,210)	(7,065)	(7,271)
Residential Portfolio Segment [Member] \| 1-4 Family Residential [Member]
Loans	1,230,110		850,300
Residential Portfolio Segment [Member] \| Home Equity Loan [Member]
Loans	360,685		181,544
Consumer Portfolio Segment [Member]
Allowance for credit losses	(5,612)	$ (5,263)	(4,970)	$ (4,753)	$ (4,621)	$ (4,705)
Consumer Portfolio Segment [Member] \| Other Loans [Member]
Loans	12,306		10,070
Consumer Portfolio Segment [Member] \| Indirect Loans [Member]
Loans	239,209		231,242
Consumer Portfolio Segment [Member] \| Direct Loans [Member]
Loans	$ 21,375		$ 16,483