Note 4 - Loans - Loans by Credit Quality Indicators, Loans Type and Year of Origination (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2023
Current fiscal year	$ 103,420	$ 181,426
Fiscal Year before Current Fiscal Year	190,757	330,978
Two Years before Current Fiscal Year	307,234	300,111
Three Years before Current Fiscal Year	275,765	189,100
Four Years before Current Fiscal Year	163,241	119,511
More than Five Years before Current Fiscal Year	458,020	394,391
Revolving	223,375	201,785
Revolving converted to term	0	6,169
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,721,812	1,723,471		$ 1,401,278
Total loans gross charge-offs	903	268	$ 266
Commercial and Industrial Portfolio Segment [Member]
Current fiscal year	19,219	17,169
Fiscal Year before Current Fiscal Year	11,914	32,331
Two Years before Current Fiscal Year	33,076	31,061
Three Years before Current Fiscal Year	24,201	11,531
Four Years before Current Fiscal Year	8,427	4,324
More than Five Years before Current Fiscal Year	6,507	5,778
Revolving	15,267	18,234
Revolving converted to term	0	113
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	118,611	120,541
Current period gross charge offs	0	0
Current period gross charge, Fiscal Year before Current Fiscal Year Write-offs	0	0
Current period gross charge offs, Two Years before Current Fiscal Year	588	0
Current period gross charge offs, Three Years before Current Fiscal Year	22	0
Current period gross charge offs, Four Years before Current Fiscal Year	0	0
Current period gross charge offs, More than Five Years before Current Fiscal Year	0	15
Revolving gross charge-offs	0	0
Revolving converted to term gross write-offs	0	0
Total loans gross charge-offs	610	15	(0)
Revolving converted to term gross write-offs	0	0
Commercial and Industrial Portfolio Segment [Member] | Pass [Member]
Current fiscal year	17,844	17,169
Fiscal Year before Current Fiscal Year	11,914	30,518
Two Years before Current Fiscal Year	31,287	29,587
Three Years before Current Fiscal Year	24,201	11,426
Four Years before Current Fiscal Year	6,930	2,732
More than Five Years before Current Fiscal Year	6,507	5,641
Revolving	14,836	16,919
Revolving converted to term	0	113
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	113,519	114,105
Commercial and Industrial Portfolio Segment [Member] | Special Mention [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	1,474
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	1,416	0
More than Five Years before Current Fiscal Year	0	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,416	1,474
Commercial and Industrial Portfolio Segment [Member] | Substandard [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	1,813
Two Years before Current Fiscal Year	1,789	0
Three Years before Current Fiscal Year	0	105
Four Years before Current Fiscal Year	81	1,592
More than Five Years before Current Fiscal Year	0	137
Revolving	431	1,315
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,301	4,962
Commercial and Industrial Portfolio Segment [Member] | Doubtful [Member]
Current fiscal year	1,375	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,375	0
Commercial Real Estate Portfolio Segment [Member]
Current fiscal year	43,461	99,055
Fiscal Year before Current Fiscal Year	111,706	208,406
Two Years before Current Fiscal Year	196,157	156,865
Three Years before Current Fiscal Year	161,622	109,810
Four Years before Current Fiscal Year	99,884	94,543
More than Five Years before Current Fiscal Year	343,616	289,555
Revolving	155,686	141,354
Revolving converted to term	0	6,056
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,112,132	1,105,644
Current period gross charge offs	0	0
Current period gross charge, Fiscal Year before Current Fiscal Year Write-offs	0	0
Current period gross charge offs, Two Years before Current Fiscal Year	0	0
Current period gross charge offs, Three Years before Current Fiscal Year	0	0
Current period gross charge offs, Four Years before Current Fiscal Year	0	0
Current period gross charge offs, More than Five Years before Current Fiscal Year	0	0
Revolving gross charge-offs	0	0
Revolving converted to term gross write-offs	0	0
Total loans gross charge-offs	(0)	(0)	67
Revolving converted to term gross write-offs	0	0
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Current fiscal year	43,461	99,055
Fiscal Year before Current Fiscal Year	111,706	200,735
Two Years before Current Fiscal Year	185,003	156,865
Three Years before Current Fiscal Year	160,126	109,810
Four Years before Current Fiscal Year	99,709	92,895
More than Five Years before Current Fiscal Year	337,270	283,564
Revolving	155,686	141,354
Revolving converted to term	0	6,056
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,092,961	1,090,334
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	7,671
Two Years before Current Fiscal Year	3,755	0
Three Years before Current Fiscal Year	1,496	0
Four Years before Current Fiscal Year	175	0
More than Five Years before Current Fiscal Year	3,640	3,004
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	9,066	10,675
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	7,399	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	1,648
More than Five Years before Current Fiscal Year	2,706	2,987
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	10,105	4,635
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Residential Portfolio Segment [Member]
Current fiscal year	33,898	55,232
Fiscal Year before Current Fiscal Year	60,626	83,957
Two Years before Current Fiscal Year	73,984	107,120
Three Years before Current Fiscal Year	87,001	62,394
Four Years before Current Fiscal Year	52,721	19,208
More than Five Years before Current Fiscal Year	107,373	98,723
Revolving	41,496	33,970
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	457,099	460,604
Current period gross charge offs	0	0
Current period gross charge, Fiscal Year before Current Fiscal Year Write-offs	0	0
Current period gross charge offs, Two Years before Current Fiscal Year	0	0
Current period gross charge offs, Three Years before Current Fiscal Year	0	0
Current period gross charge offs, Four Years before Current Fiscal Year	0	4
Current period gross charge offs, More than Five Years before Current Fiscal Year	0	0
Revolving gross charge-offs	0	0
Revolving converted to term gross write-offs	0	0
Total loans gross charge-offs	(0)	4	5
Revolving converted to term gross write-offs	0	0
Residential Portfolio Segment [Member] | Pass [Member]
Current fiscal year	33,898	55,232
Fiscal Year before Current Fiscal Year	60,232	83,511
Two Years before Current Fiscal Year	73,984	107,120
Three Years before Current Fiscal Year	86,712	62,177
Four Years before Current Fiscal Year	52,241	19,208
More than Five Years before Current Fiscal Year	104,254	95,643
Revolving	41,482	33,800
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	452,803	456,691
Residential Portfolio Segment [Member] | Special Mention [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	207	18
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	207	18
Residential Portfolio Segment [Member] | Substandard [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	394	446
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	289	217
Four Years before Current Fiscal Year	480	0
More than Five Years before Current Fiscal Year	2,912	3,062
Revolving	14	170
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	4,089	3,895
Residential Portfolio Segment [Member] | Doubtful [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Consumer Portfolio Segment [Member]
Current fiscal year	6,553	8,087
Fiscal Year before Current Fiscal Year	5,053	5,820
Two Years before Current Fiscal Year	3,639	4,868
Three Years before Current Fiscal Year	2,792	4,671
Four Years before Current Fiscal Year	1,900	1,390
More than Five Years before Current Fiscal Year	495	304
Revolving	66	460
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	20,498	25,600
Current period gross charge offs	0	0
Current period gross charge, Fiscal Year before Current Fiscal Year Write-offs	1	0
Current period gross charge offs, Two Years before Current Fiscal Year	39	62
Current period gross charge offs, Three Years before Current Fiscal Year	3	21
Current period gross charge offs, Four Years before Current Fiscal Year	0	0
Current period gross charge offs, More than Five Years before Current Fiscal Year	0	0
Revolving gross charge-offs	0	0
Revolving converted to term gross write-offs	0	0
Total loans gross charge-offs	43	83	37
Revolving converted to term gross write-offs	0	0
Consumer Portfolio Segment [Member] | Pass [Member]
Current fiscal year	6,553	8,087
Fiscal Year before Current Fiscal Year	5,053	5,820
Two Years before Current Fiscal Year	3,598	4,868
Three Years before Current Fiscal Year	2,792	4,671
Four Years before Current Fiscal Year	1,900	1,382
More than Five Years before Current Fiscal Year	491	304
Revolving	66	460
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	20,453	25,592
Consumer Portfolio Segment [Member] | Special Mention [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Consumer Portfolio Segment [Member] | Substandard [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	41	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	8
More than Five Years before Current Fiscal Year	4	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	45	8
Consumer Portfolio Segment [Member] | Doubtful [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Agricultural Portfolio [Member]
Current fiscal year	289	1,883
Fiscal Year before Current Fiscal Year	1,458	464
Two Years before Current Fiscal Year	378	197
Three Years before Current Fiscal Year	149	694
Four Years before Current Fiscal Year	309	46
More than Five Years before Current Fiscal Year	29	31
Revolving	10,681	7,685
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	13,293	11,000
Current period gross charge offs	0	0
Current period gross charge, Fiscal Year before Current Fiscal Year Write-offs	0	0
Current period gross charge offs, Two Years before Current Fiscal Year	0	0
Current period gross charge offs, Three Years before Current Fiscal Year	0	0
Current period gross charge offs, Four Years before Current Fiscal Year	57	0
Current period gross charge offs, More than Five Years before Current Fiscal Year	0	0
Revolving gross charge-offs	0	0
Revolving converted to term gross write-offs	0	0
Total loans gross charge-offs	57	(0)	(0)
Revolving converted to term gross write-offs	0	0
Agricultural Portfolio [Member] | Pass [Member]
Current fiscal year	289	1,883
Fiscal Year before Current Fiscal Year	1,458	464
Two Years before Current Fiscal Year	378	197
Three Years before Current Fiscal Year	149	694
Four Years before Current Fiscal Year	309	46
More than Five Years before Current Fiscal Year	29	31
Revolving	10,681	7,685
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	13,293	11,000
Agricultural Portfolio [Member] | Special Mention [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Agricultural Portfolio [Member] | Substandard [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Agricultural Portfolio [Member] | Doubtful [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Other Loans [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	179	82
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	179	82
Current period gross charge offs	0	0
Current period gross charge, Fiscal Year before Current Fiscal Year Write-offs	0	0
Current period gross charge offs, Two Years before Current Fiscal Year	0	0
Current period gross charge offs, Three Years before Current Fiscal Year	0	0
Current period gross charge offs, Four Years before Current Fiscal Year	0	0
Current period gross charge offs, More than Five Years before Current Fiscal Year	0	0
Revolving gross charge-offs	193	166
Revolving converted to term gross write-offs	0	0
Total loans gross charge-offs	193	166	$ 157
Revolving converted to term gross write-offs	0	0
Other Loans [Member] | Pass [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	179	82
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	179	82
Other Loans [Member] | Special Mention [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Other Loans [Member] | Substandard [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Other Loans [Member] | Doubtful [Member]
Current fiscal year	0	0
Fiscal Year before Current Fiscal Year	0	0
Two Years before Current Fiscal Year	0	0
Three Years before Current Fiscal Year	0	0
Four Years before Current Fiscal Year	0	0
More than Five Years before Current Fiscal Year	0	0
Revolving	0	0
Revolving converted to term	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 0	$ 0