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Note 4 - Loans - Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 1,719,060	$ 1,723,471	$ 1,401,278
Financing Receivable, 90 Days or More Past Due, Still Accruing	282	72
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	675	4,084
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	700	444
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3,162	101
Financial Asset, Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	4,537	4,629
Financial Asset, Not Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,714,523	1,718,842
Commercial and Industrial Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	119,215	120,541
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial and Industrial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial and Industrial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial and Industrial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial and Industrial Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial and Industrial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	119,215	120,541
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,103,506	1,105,644
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	216,262	206,705
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	72
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	509,978	501,108
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Farmland [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	38,005	37,367
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	239,645	240,033
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Construction Loans Secured by 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	15,341	9,058
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Construction Loans Secured By Other Real Estate [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	84,275	111,373
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Non-owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	2,645
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Farmland [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	52	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Multifamily Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans Secured by 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans Secured By Other Real Estate [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Non-owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Farmland [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Multifamily Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans Secured by 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans Secured By Other Real Estate [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	72
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Non-owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,642	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Farmland [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Multifamily Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans Secured by 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans Secured By Other Real Estate [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	72
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Non-owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,642	2,645
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Farmland [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	52	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Multifamily Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Construction Loans Secured by 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Construction Loans Secured By Other Real Estate [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	216,262	206,633
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Non-owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	507,336	498,463
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Farmland [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	37,953	37,367
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Multifamily Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	239,645	240,033
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Construction Loans Secured by 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	15,341	9,058
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Construction Loans Secured By Other Real Estate [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	84,275	111,373
Residential Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	460,559	460,604
Residential Portfolio Segment [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	395,906	402,026
Financing Receivable, 90 Days or More Past Due, Still Accruing	198	0
Residential Portfolio Segment [Member] | Secured By Junior Liens on 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	21,683	19,999
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Residential Portfolio Segment [Member] | Home Equity Line-of-credit loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	42,970	38,579
Financing Receivable, 90 Days or More Past Due, Still Accruing	73	0
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	4	1,020
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Secured By Junior Liens on 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	27
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity Line-of-credit loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	98	174
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	626	414
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Secured By Junior Liens on 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity Line-of-credit loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	49	30
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	436	29
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Secured By Junior Liens on 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Home Equity Line-of-credit loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	73	0
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,066	1,463
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Secured By Junior Liens on 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	27
Residential Portfolio Segment [Member] | Financial Asset, Past Due [Member] | Home Equity Line-of-credit loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	220	204
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Secured By Senior Liens On 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	394,840	400,563
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Secured By Junior Liens on 1-4 Family Dwellings [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	21,683	19,972
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Home Equity Line-of-credit loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	42,750	38,375
Consumer Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	22,113	25,600
Financing Receivable, 90 Days or More Past Due, Still Accruing	11	0
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	25	136
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	25	0
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	11	0
Consumer Portfolio Segment [Member] | Financial Asset, Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	61	136
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	22,052	25,464
Agricultural Portfolio [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	13,171	11,000
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Agricultural Portfolio [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Agricultural Portfolio [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Agricultural Portfolio [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Agricultural Portfolio [Member] | Financial Asset, Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Agricultural Portfolio [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	13,171	11,000
Other Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	496	82
Financing Receivable, 90 Days or More Past Due, Still Accruing	0	0
Other Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	496	82
Other Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Other Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	0	0
Other Loans [Member] | Financial Asset, Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	496	82
Other Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 0	$ 0

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- Definition

Amortized cost excluding accrued interest, of financing receivable 90 days or more past due and still accruing. 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 16
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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- Definition

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+ 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
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

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