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Note 20 - Business Acquisition (Details Textual) - USD ($)		12 Months Ended
	Jan. 12, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2016
Goodwill, Ending Balance		$ 15,071,000	$ 15,071,000
Goodwill, Impairment Loss		0	0	$ 0
Finite-Lived Core Deposits, Gross		2,400,000	2,700,000
Business Combination, Acquisition Related Costs			1,060,000
Core Deposits [Member]
Finite-Lived Intangible Assets, Accumulated Amortization		1,000,000	692,000
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member]
Business Acquisition, Percentage of Voting Interests Acquired					100.00%
Business Combination, Consideration Transferred, Total	$ 42,168,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	544,610
Payments to Acquire Businesses, Gross	$ 21,173,000
Shares Issued, Price Per Share	$ 38.55
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain			488,000
Goodwill, Ending Balance	$ 10,512,000		10,500,000
Goodwill, Impairment Loss		0	0
Goodwill, Purchase Accounting Adjustments			575,000
Business Combination, Acquisition Related Costs			1,100,000
Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member] | Core Deposits [Member]
Finite-Lived Core Deposits, Gross		2,400,000	2,700,000
Finite-Lived Intangible Assets, Accumulated Amortization		$ 690,000	$ 342,000

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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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.

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In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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Bank deposits belonging to an acquired bank that can be counted on as a stable source of lending funds. These deposits have the following attributes: predictable costs and low sensitivity to interest rates. This intangible asset is usually amortized over its estimated useful life.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Per share or per unit amount of equity securities issued.

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