Note 4 - Loans - Schedule of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Jun. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Loans	$ 4,840,848		$ 3,293,544
Net deferred loan costs	13,970		11,169
Allowance for credit losses	(53,531)	$ (53,285)	(36,811)	$ (39,528)	$ (38,563)	$ (35,863)
Net loans	4,801,287		3,267,902
Commercial Real Estate Portfolio Segment [Member]
Allowance for credit losses	(28,074)	(28,671)	(20,064)	(22,980)	(21,627)	(19,259)
Commercial Real Estate Portfolio Segment [Member] \| Owner Occupied [Member]
Loans	631,940		393,061
Commercial Real Estate Portfolio Segment [Member] \| Nonowner Occupied [Member]
Loans	1,038,674		710,468
Commercial Real Estate Portfolio Segment [Member] \| Farmland [Member]
Loans	225,046		211,370
Commercial Real Estate Portfolio Segment [Member] \| Other Loans [Member]
Loans	388,143		294,587
Commercial Portfolio Segment [Member]
Allowance for credit losses	(8,237)	(7,950)	(4,536)	(4,626)	(4,973)	(4,628)
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Loans	598,720		340,224
Commercial Portfolio Segment [Member] \| Agricultural [Member]
Loans	58,344		54,195
Residential Portfolio Segment [Member]
Allowance for credit losses	(11,182)	(11,052)	(7,241)	(7,208)	(7,210)	(7,271)
Residential Portfolio Segment [Member] \| 1-4 Family Residential [Member]
Loans	1,238,920		850,300
Residential Portfolio Segment [Member] \| Home Equity Loan [Member]
Loans	372,256		181,544
Consumer Portfolio Segment [Member]
Allowance for credit losses	(6,038)	$ (5,612)	(4,970)	$ (4,714)	$ (4,753)	$ (4,705)
Consumer Portfolio Segment [Member] \| Other Loans [Member]
Loans	12,463		10,070
Consumer Portfolio Segment [Member] \| Indirect Loans [Member]
Loans	255,107		231,242
Consumer Portfolio Segment [Member] \| Direct Loans [Member]
Loans	$ 21,235		$ 16,483