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Note 6 - Loans and the Allowance for Credit Losses - Aging of Modified Loans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Modified	$ 70,295,000	$ 211,000	$ 82,988,000	$ 255,000
Financial Asset, Not Past Due [Member]
Modified			100,786
Financial Asset, 30 to 89 Days Past Due [Member]
Modified			0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified			0
Commercial Portfolio Segment [Member]
Modified	6,491,000	0	17,767,000	44,000
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Modified			28,084,000
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified			0
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified			0
Commercial Real Estate Portfolio Segment [Member]
Modified	$ 63,804,000	$ 211,000	63,804,000	$ 211,000
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Modified			71,285,000
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified			0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified			0
Residential Portfolio Segment [Member]
Modified			1,417,000
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Modified			1,417,000
Residential Portfolio Segment [Member] | Financial Asset, 30 to 89 Days Past Due [Member]
Modified			0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified			$ 0

X

- Definition

Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Paragraph 42
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

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