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Note 2 - Securities - Carrying Amount of Securities Pledged as Collateral (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Asset Pledged as Collateral [Member] |  |
Securities pledged for Community Reinvestment Act credits | $ 250 | $ 273

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References No definition available. + Details
Name: | us-gaap_DebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_PledgedStatusAxis=us-gaap_AssetPledgedAsCollateralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |