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Note 20 - Business Acquisition - Assets Acquired and Liabilities Assumed (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 12, 2017 | Dec. 31, 2017 | Dec. 31, 2018
Previously held equity interest in Liberty |  | $ 1,068,000 |
Net assets acquired: |  |  |
Goodwill, Ending Balance |  | 15,071,000 | $ 15,071,000
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member] |  |  |
Total purchase price | $ 42,168,000 |  |
Previously held equity interest in Liberty | 1,068,000 |  |
Net assets acquired: |  |  |
Cash | 26,604,000 |  |
Loans and loans held for sale | 201,341,000 |  |
Premises and equipment, net | 325,000 |  |
Accrued interest receivable | 440,000 |  |
Bank-owned life insurance | 1,681,000 |  |
Core deposit intangible | 3,087,000 |  |
Other assets | 997,000 |  |
Time deposits | (30,744,000) |  |
Non-time deposits | (167,300,000) |  |
Accrued interest payable | (47,000) |  |
Deferred taxes | (906,000) |  |
Other liabilities | (2,754,000) |  |
Total net assets acquired | 32,724,000 |  |
Goodwill, Ending Balance | $ 10,512,000 | $ 10,500,000 |

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- Definition Amount due from accrued interest receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged, acquired at the acquisition date. + References No definition available. + Details
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- Definition Amount of bank-owned life insurance acquired at the acquisition date. + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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