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Note 9 - Pledged Collateral Related to Securities Sold Under Repurchase Agreements - Pledged Collateral at Estimated Fair Value (Details) - Asset Pledged as Collateral [Member] - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Maturity Overnight [Member]
Securities sold under agreements to repurchase	$ 75,568
Maturity Overnight [Member] | US Treasury and Government [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase	22,489
Maturity Overnight [Member] | US Government Agencies Debt Securities [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase	46,027
Maturity Overnight [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase	$ 7,052
Maturity Greater than 90 Days [Member]
Securities sold under agreements to repurchase		$ 75,206
Maturity Greater than 90 Days [Member] | US Treasury and Government [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase		22,877
Maturity Greater than 90 Days [Member] | US Government Agencies Debt Securities [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase		44,960
Maturity Greater than 90 Days [Member] | Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase		$ 7,369

X

- Definition

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 940
-SubTopic 320
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479035/940-320-45-2

+ Details

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

X

- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
Data Type:	na
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- Details

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