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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, 2023	Dec. 31, 2022
Maturity Overnight [Member]
Securities sold under agreements to repurchase	$ 73,273
Maturity Overnight [Member] | US Treasury and Government [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase	18,862
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	46,741
Maturity Overnight [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase	$ 7,670
Maturity Greater than 90 Days [Member]
Securities sold under agreements to repurchase		$ 60,914
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		12,555
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		39,226
Maturity Greater than 90 Days [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Collateral Related to Securities Sold Under Agreements to Repurchase [Member]
Securities sold under agreements to repurchase		$ 9,133

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://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481961/940-320-45-2

+ 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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Balance Type:
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X

- 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:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
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X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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