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Note 8 - Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Intangible asset, gross amount | $ 6,946 | $ 6,946
Intangible asset, accumulated amortization | 3,973 | 3,813
Core Deposits [Member] |  |
Intangible asset, gross amount | 6,411 | 6,411
Intangible asset, accumulated amortization | 3,633 | 3,493
Customer Lists [Member] |  |
Intangible asset, gross amount | 535 | 535
Intangible asset, accumulated amortization | $ 340 | $ 320

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