Note 6 - Allowance for Credit Losses - Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024		Sep. 30, 2023	Dec. 31, 2023
Balance, Loans	$ 34,885	$ 36,177	$ 36,189	[1]	$ 30,556	$ 30,556
Balance, Allowance for credit losses - loan commitments	441	964	746		1,196	1,196
Total allowance for credit losses beginning of year	35,326	37,141	36,935		31,752	31,752
Provision for (recovery of) credit losses - loans	1,360	1,315	2,820		7,394
Provision for credit losses - loan commitments	0	(206)	(305)		(438)
Total (recovery of) provision for credit losses - loans and loan commitments	1,360	1,109	2,515		6,956
Charge-offs	(1,800)	(2,157)	(5,847)		(6,720)	(8,825)
Recoveries	673	696	1,956		2,790
Net recoveries (charge-offs)	(1,127)	(1,461)	(3,891)		(3,930)
Balance, Allowance for credit losses - loans	35,118	36,031	35,118		36,031	36,189	[1]
Balance, Allowance for credit losses - loan commitments	441	758	441		758	746
Ending balance	35,559	36,789	35,559		36,789	36,935
Recovery of credit losses - loan commitments	0	(206)	(305)		(438)
Financial Asset Acquired with Credit Deterioration [Member] | Surrey [Member]
Balance, Loans			0		2,011	2,011
Balance, Allowance for credit losses - loans						0
Commercial Portfolio Segment [Member]
Balance, Loans	20,352	21,515	21,850		17,213	17,213
Balance, Allowance for credit losses - loan commitments	289	786	597		1,018	1,018
Total allowance for credit losses beginning of year	20,641	22,301	22,447		18,231	18,231
Provision for (recovery of) credit losses - loans	(151)	39	(1,337)		2,425
Provision for credit losses - loan commitments	0	(194)	(308)		(426)
Total (recovery of) provision for credit losses - loans and loan commitments	(151)	(155)	(1,645)		1,999
Charge-offs	(89)	(245)	(645)		(551)
Recoveries	253	227	497		997
Net recoveries (charge-offs)	164	(18)	(148)		446
Balance, Allowance for credit losses - loans	20,365	21,536	20,365		21,536	21,850
Balance, Allowance for credit losses - loan commitments	289	592	289		592	597
Ending balance	20,654	22,128	20,654		22,128	22,447
Recovery of credit losses - loan commitments	0	(194)	(308)		(426)
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Surrey [Member]
Balance, Loans			0		1,452	1,452
Balance, Allowance for credit losses - loans						0
Consumer Real Estate Portfolio Segment [Member]
Balance, Loans	9,879	9,956	9,693		8,931	8,931
Balance, Allowance for credit losses - loan commitments	118	150	121		156	156
Total allowance for credit losses beginning of year	9,997	10,106	9,814		9,087	9,087
Provision for (recovery of) credit losses - loans	242	(207)	300		276
Provision for credit losses - loan commitments	0	(9)	(3)		(15)
Total (recovery of) provision for credit losses - loans and loan commitments	242	(216)	297		261
Charge-offs	(22)	(73)	(151)		(396)
Recoveries	57	82	314		418
Net recoveries (charge-offs)	35	9	163		22
Balance, Allowance for credit losses - loans	10,156	9,758	10,156		9,758	9,693
Balance, Allowance for credit losses - loan commitments	118	141	118		141	121
Ending balance	10,274	9,899	10,274		9,899	9,814
Recovery of credit losses - loan commitments	0	(9)	(3)		(15)
Consumer Real Estate Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Surrey [Member]
Balance, Loans			0		529	529
Balance, Allowance for credit losses - loans						0
Consumer and Other Portfolio Segment [Member]
Balance, Loans	4,654	4,706	4,646		4,412	4,412
Balance, Allowance for credit losses - loan commitments	34	28	28		22	22
Total allowance for credit losses beginning of year	4,688	4,734	4,674		4,434	4,434
Provision for (recovery of) credit losses - loans	1,269	1,483	3,857		4,693
Provision for credit losses - loan commitments	0	(3)	6		3
Total (recovery of) provision for credit losses - loans and loan commitments	1,269	1,480	3,863		4,696
Charge-offs	(1,689)	(1,839)	(5,051)		(5,773)	(7,660)
Recoveries	363	387	1,145		1,375
Net recoveries (charge-offs)	(1,326)	(1,452)	(3,906)		(4,398)
Balance, Allowance for credit losses - loans	4,597	4,737	4,597		4,737	4,646
Balance, Allowance for credit losses - loan commitments	34	25	34		25	28
Ending balance	4,631	4,762	4,631		4,762	4,674
Recovery of credit losses - loan commitments	$ 0	$ (3)	6		3
Consumer and Other Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Surrey [Member]
Balance, Loans			$ 0		$ 30	30
Balance, Allowance for credit losses - loans						$ 0

[1] Derived from audited financial statements