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Note 8 - Deposits - Public Entity Deposits (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Collateralized by investment securities | $ 6,350 | $ 8,440
U.S. govt. sponsored agency securities. |  |
Collateralized by investment securities | 3,080 | 3,668
Residential mortgage-backed and related securities |  |
Collateralized by investment securities | $ 3,270 | $ 4,772

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- Definition Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |