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Note 9 - Subsequent Event (Details Textual) - Merger of Liberty Bank, N.A. into The Middlefield Banking Company [member] - USD ($)	5 Months Ended
	Dec. 31, 2016	Jul. 28, 2016
Subsequent Event [Member] | Liberty Bank, N.A. [Member]
Business Combination, Merger Agreement, Special Dividend to Be Paid to Entity's Shareholders Before Merger		$ 3
Subsequent Event [Member]
Business Combination, Merger Agreement, Percentage of Merger Consideration to Be Paid in Common Stock		45.00%
Business Combination, Merger Agreement, Cash Per Share of Reporting Entity Common Stock		$ 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 Combination, Shares in Acquired Entity Owned Prior to Merger		23,218
Business Combination, Ownership Percentage in Acquired Entity Prior to Merger		2.40%
Scenario, Forecast [Member]
Payments to Acquire Businesses, Gross	$ 1,147,000

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	mbcn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the percentage of the total merger consideration that is to be paid in the form of common stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	mbcn_
Data Type:	num:percentItemType
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Period Type:	instant

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.

+ Details

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Namespace Prefix:	mbcn_
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X

- Definition

Represents the amount of a special dividend to be paid by the specified entity to its shareholders prior to the merger, in accordance with the merger agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	mbcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the percentage of the acquired entity's stock owned by the reporting entity prior to a merger.

+ References

No definition available.

+ Details

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Namespace Prefix:	mbcn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of shares of the acquired entity's stock owned by the reporting entity prior to a merger.

+ References

No definition available.

+ Details

Name:	mbcn_BusinessCombinationSharesInAcquiredEntityOwnedPriorToMerger
Namespace Prefix:	mbcn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

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