Note 4 - Loans - Schedule of Allowance For Credit Loss (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Beginning balance	$ 38,563	$ 33,991	$ 35,863	$ 34,440	$ 34,440
Provision (credit) for credit losses	1,501	6,807	5,109	7,932
Loans charged off	(869)	(5,116)	(2,315)	(7,059)
Recoveries	333	504	871	873
Total ending allowance balance	39,528	36,186	39,528	36,186	35,863
Commercial Real Estate Portfolio Segment [Member]
Beginning balance	21,627	17,223	19,259	18,150	18,150
Provision (credit) for credit losses	1,428	6,226	3,840	5,427
Loans charged off	(75)	(4,401)	(141)	(4,547)
Recoveries	0	3	22	21
Total ending allowance balance	22,980	19,051	22,980	19,051	19,259
Commercial Portfolio Segment [Member]
Beginning balance	4,973	4,628	4,628	5,087	5,087
Provision (credit) for credit losses	(204)	(24)	572	466
Loans charged off	(319)	(396)	(973)	(1,411)
Recoveries	176	407	399	473
Total ending allowance balance	4,626	4,615	4,626	4,615	4,628
Residential Portfolio Segment [Member]
Beginning balance	7,210	7,422	7,271	6,916	6,916
Provision (credit) for credit losses	127	117	84	676
Loans charged off	(154)	0	(231)	(81)
Recoveries	25	10	84	38
Total ending allowance balance	7,208	7,549	7,208	7,549	7,271
Consumer Portfolio Segment [Member]
Beginning balance	4,753	4,718	4,705	4,287	4,287
Provision (credit) for credit losses	150	488	613	1,363
Loans charged off	(321)	(319)	(970)	(1,020)
Recoveries	132	84	366	341
Total ending allowance balance	$ 4,714	$ 4,971	$ 4,714	$ 4,971	$ 4,705