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Note 1 - Basis of Presentation (Details Textual) - Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member]	Jan. 12, 2017 USD ($) $ / shares shares
Business Combination, Merger Agreement, Cash Per Share of Reporting Entity Common Stock | $ / shares	$ 37.96
Business Combination, Merger Agreement, Ratio of Shares of Reporting Entity's Common Stock for Each Share of Acquired Entity's Common Stock	1.1934
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	544,610
Business Combination, Consideration Transferred | $	$ 42,168,000

X

- Definition

Represents the cash paid, or to be paid, per share of the reporting entity's common stock.

+ References

No definition available.

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X

- Definition

Represents the ratio of the shares of the reporting entity's common stock for each share of the acquired entity's common stock.

+ References

No definition available.

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X

- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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