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Note 6 - Goodwill and Intangibles - Goodwill (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2020 | Nov. 30, 2020 | Nov. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Balance at the beginning of period |  |  |  | $ 74,748 | $ 74,748 | $ 77,832 | $ 28,334
Acquisition |  |  |  |  |  |  | 49,741
Goodwill impairment | $ 0 | $ 0 |  |  | (500) | (3,000) |
Balance at the end of period |  |  |  |  | 74,066 | 74,748 | 77,832
Asset held-for-sale | Bates Companies |  |  |  |  |  |  |
Sale |  |  |  |  | (182) |  |
Springfield Bancshares |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  | 45,975
Bates Companies |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  | 3,766
Acquisition - measurement period adjustment |  |  |  |  |  | (84) |
Goodwill impairment |  |  | $ (3,000) | $ (500) | (500) | $ (3,000) |
Balance at the end of period |  |  |  |  | $ 3,700 |  |
Guaranty Bank [Member] |  |  |  |  |  |  |
Acquisition - measurement period adjustment |  |  |  |  |  |  | $ (243)

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