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Note 4 - Loans - Loans by Credit Quality Indicators, Loans Type and Year of Origination (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	Dec. 31, 2022
Current fiscal year	$ 68,775		$ 68,775		$ 181,426
Fiscal Year before Current Fiscal Year	199,883		199,883		330,978
Two Years before Current Fiscal Year	311,266		311,266		300,111
Three Years before Current Fiscal Year	287,660		287,660		189,100
Four Years before Current Fiscal Year	169,599		169,599		119,511
More than Five Years before Current Fiscal Year	474,064		474,064		394,391
Revolving	207,813		207,813		201,785
Revolving converted to term	0		0		6,169
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,719,060		1,719,060		1,723,471	$ 1,401,278
Total loans gross charge-offs	122	$ 59	286	$ 144
Commercial and Industrial Portfolio Segment [Member]
Current fiscal year	11,721		11,721		17,169
Fiscal Year before Current Fiscal Year	12,284		12,284		32,331
Two Years before Current Fiscal Year	37,065		37,065		31,061
Three Years before Current Fiscal Year	25,803		25,803		11,531
Four Years before Current Fiscal Year	9,966		9,966		4,324
More than Five Years before Current Fiscal Year	6,998		6,998		5,778
Revolving	15,378		15,378		18,234
Revolving converted to term	0		0		113
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	119,215		119,215		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			0		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	22	(0)	22	15	15
Revolving converted to term gross write-offs			0		0
Commercial and Industrial Portfolio Segment [Member] | Pass [Member]
Current fiscal year	11,721		11,721		17,169
Fiscal Year before Current Fiscal Year	12,284		12,284		30,518
Two Years before Current Fiscal Year	33,311		33,311		29,587
Three Years before Current Fiscal Year	25,803		25,803		11,426
Four Years before Current Fiscal Year	9,878		9,878		2,732
More than Five Years before Current Fiscal Year	6,895		6,895		5,641
Revolving	14,947		14,947		16,919
Revolving converted to term	0		0		113
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	114,839		114,839		114,105
Commercial and Industrial Portfolio Segment [Member] | Special Mention [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	1,966		1,966		1,474
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,966		1,966		1,474
Commercial and Industrial Portfolio Segment [Member] | Substandard [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		1,813
Two Years before Current Fiscal Year	1,788		1,788		0
Three Years before Current Fiscal Year	0		0		105
Four Years before Current Fiscal Year	88		88		1,592
More than Five Years before Current Fiscal Year	103		103		137
Revolving	431		431		1,315
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,410		2,410		4,962
Commercial and Industrial Portfolio Segment [Member] | Doubtful [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0		0
Commercial Real Estate Portfolio Segment [Member]
Current fiscal year	22,944		22,944		99,055
Fiscal Year before Current Fiscal Year	118,628		118,628		208,406
Two Years before Current Fiscal Year	194,140		194,140		156,865
Three Years before Current Fiscal Year	169,573		169,573		109,810
Four Years before Current Fiscal Year	102,689		102,689		94,543
More than Five Years before Current Fiscal Year	354,223		354,223		289,555
Revolving	141,309		141,309		141,354
Revolving converted to term	0		0		6,056
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,103,506		1,103,506		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)	(0)	(0)	0
Revolving converted to term gross write-offs			0		0
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Current fiscal year	22,944		22,944		99,055
Fiscal Year before Current Fiscal Year	118,628		118,628		200,735
Two Years before Current Fiscal Year	182,884		182,884		156,865
Three Years before Current Fiscal Year	168,066		168,066		109,810
Four Years before Current Fiscal Year	102,689		102,689		92,895
More than Five Years before Current Fiscal Year	347,233		347,233		283,564
Revolving	141,309		141,309		141,354
Revolving converted to term	0		0		6,056
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,083,753		1,083,753		1,090,334
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		7,671
Two Years before Current Fiscal Year	3,788		3,788		0
Three Years before Current Fiscal Year	1,507		1,507		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	3,361		3,361		3,004
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	8,656		8,656		10,675
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	7,468		7,468		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		1,648
More than Five Years before Current Fiscal Year	3,629		3,629		2,987
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	11,097		11,097		4,635
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0		0
Residential Portfolio Segment [Member]
Current fiscal year	27,265		27,265		55,232
Fiscal Year before Current Fiscal Year	61,660		61,660		83,957
Two Years before Current Fiscal Year	75,637		75,637		107,120
Three Years before Current Fiscal Year	88,956		88,956		62,394
Four Years before Current Fiscal Year	54,192		54,192		19,208
More than Five Years before Current Fiscal Year	112,155		112,155		98,723
Revolving	40,694		40,694		33,970
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	460,559		460,559		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	(0)	4	4
Revolving converted to term gross write-offs			0		0
Residential Portfolio Segment [Member] | Pass [Member]
Current fiscal year	27,265		27,265		55,232
Fiscal Year before Current Fiscal Year	61,429		61,429		83,511
Two Years before Current Fiscal Year	75,446		75,446		107,120
Three Years before Current Fiscal Year	88,665		88,665		62,177
Four Years before Current Fiscal Year	53,705		53,705		19,208
More than Five Years before Current Fiscal Year	108,750		108,750		95,643
Revolving	40,522		40,522		33,800
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	455,782		455,782		456,691
Residential Portfolio Segment [Member] | Special Mention [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	235		235		18
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	235		235		18
Residential Portfolio Segment [Member] | Substandard [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	231		231		446
Two Years before Current Fiscal Year	191		191		0
Three Years before Current Fiscal Year	291		291		217
Four Years before Current Fiscal Year	487		487		0
More than Five Years before Current Fiscal Year	3,170		3,170		3,062
Revolving	172		172		170
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	4,542		4,542		3,895
Residential Portfolio Segment [Member] | Doubtful [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0		0
Consumer Portfolio Segment [Member]
Current fiscal year	5,895		5,895		8,087
Fiscal Year before Current Fiscal Year	5,840		5,840		5,820
Two Years before Current Fiscal Year	4,040		4,040		4,868
Three Years before Current Fiscal Year	3,174		3,174		4,671
Four Years before Current Fiscal Year	2,434		2,434		1,390
More than Five Years before Current Fiscal Year	659		659		304
Revolving	71		71		460
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	22,113		22,113		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	(0)	1	43	10	83
Revolving converted to term gross write-offs			0		0
Consumer Portfolio Segment [Member] | Pass [Member]
Current fiscal year	5,895		5,895		8,087
Fiscal Year before Current Fiscal Year	5,840		5,840		5,820
Two Years before Current Fiscal Year	4,015		4,015		4,868
Three Years before Current Fiscal Year	3,163		3,163		4,671
Four Years before Current Fiscal Year	2,434		2,434		1,382
More than Five Years before Current Fiscal Year	654		654		304
Revolving	71		71		460
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	22,072		22,072		25,592
Consumer Portfolio Segment [Member] | Special Mention [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0		0
Consumer Portfolio Segment [Member] | Substandard [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	25		25		0
Three Years before Current Fiscal Year	11		11		0
Four Years before Current Fiscal Year	0		0		8
More than Five Years before Current Fiscal Year	5		5		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	41		41		8
Consumer Portfolio Segment [Member] | Doubtful [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0		0
Agricultural Portfolio [Member]
Current fiscal year	950		950		1,883
Fiscal Year before Current Fiscal Year	1,471		1,471		464
Two Years before Current Fiscal Year	384		384		197
Three Years before Current Fiscal Year	154		154		694
Four Years before Current Fiscal Year	318		318		46
More than Five Years before Current Fiscal Year	29		29		31
Revolving	9,865		9,865		7,685
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	13,171		13,171		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)	57	(0)	0
Revolving converted to term gross write-offs			0		0
Agricultural Portfolio [Member] | Pass [Member]
Current fiscal year	950		950		1,883
Fiscal Year before Current Fiscal Year	1,471		1,471		464
Two Years before Current Fiscal Year	384		384		197
Three Years before Current Fiscal Year	154		154		694
Four Years before Current Fiscal Year	318		318		46
More than Five Years before Current Fiscal Year	29		29		31
Revolving	9,865		9,865		7,685
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	13,171		13,171		11,000
Agricultural Portfolio [Member] | Special Mention [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0		0
Agricultural Portfolio [Member] | Substandard [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0		0
Agricultural Portfolio [Member] | Doubtful [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0		0
Other Loans [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	496		496		82
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	496		496		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			164		166
Revolving converted to term gross write-offs			0		0
Total loans gross charge-offs	43	$ 54	164	$ 115	166
Revolving converted to term gross write-offs			0		0
Other Loans [Member] | Pass [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	496		496		82
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	496		496		82
Other Loans [Member] | Special Mention [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0		0
Other Loans [Member] | Substandard [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0		0		0
Other Loans [Member] | Doubtful [Member]
Current fiscal year	0		0		0
Fiscal Year before Current Fiscal Year	0		0		0
Two Years before Current Fiscal Year	0		0		0
Three Years before Current Fiscal Year	0		0		0
Four Years before Current Fiscal Year	0		0		0
More than Five Years before Current Fiscal Year	0		0		0
Revolving	0		0		0
Revolving converted to term	0		0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 0		$ 0		$ 0

X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
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