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Note 7 - Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Intangible asset, gross amount | $ 6,946 | $ 6,946
Intangible asset, accumulated amortization | 5,517 | 5,015
Core Deposits [Member] |  |
Intangible asset, gross amount | 6,411 | 6,411
Intangible asset, accumulated amortization | 4,982 | 4,539
Customer Lists [Member] |  |
Intangible asset, gross amount | 535 | 535
Intangible asset, accumulated amortization | $ 535 | $ 476

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