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Note 21 - Business Acquisition - Business Purchase (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 01, 2022 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Goodwill resulting from the Liberty merger |  | $ 31,735 | $ 15,071
Liberty Bancshares Inc [Member] |  |  |
Middlefield Banc Corp. shares issued (in shares) | 2,561,513 |  |
Value assigned to Middlefield Banc Corp. common shares (in dollars per share) | $ 28.60 |  |
Purchase price assigned to Liberty common shares exchanged for | $ 73,259 |  |
Cash paid in lieu of fractional shares | 6 |  |
Total Purchase Price | 73,265 |  |
Liberty shareholders equity | 49,041 |  |
Allowance for loan loss | 4,497 |  |
Loans - interest rate | 646 |  |
Loans - general credit | (3,433) |  |
Core deposit intangible | 6,669 |  |
Investments | (1,461) |  |
Mortgage servicing rights | 830 |  |
Other | 94 |  |
Time deposits | (228) |  |
Deferred taxes | (54) |  |
Total net assets acquired | 56,601 |  |
Goodwill resulting from the Liberty merger | $ 16,664 | $ 16,664 | $ 0

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