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Note 2 - Sales/Mergers/Acquisitions - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Premises and equipment |  |  |  |  | $ 6,092
Core deposit intangible |  |  |  |  | $ 10,064
PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Remaining life of loan (in months) |  |  |  | 8 months | 8 months
Springfield Bancshares |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Premises and equipment | $ 6,092 |  |  |  |
Core deposit intangible | 8,209 |  |  |  |
Springfield Bancshares | PCI Loans |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Nonaccretable discount recognized |  | $ 892 | $ 0 | $ 0 | $ 0
Amount accreted to income | 159 |  | $ 512 | $ 153 | $ 396
One Branch Location [Member] | Springfield Bancshares |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Premises and equipment | $ 6,100 |  |  |  |
Property, plant and equipment, useful life | 39 years |  |  |  |
Core Deposits [Member] | Springfield Bancshares |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 10 years |  |  |  |
Core deposit intangible | $ 8,200 |  |  |  |

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