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Note 20 - Business Acquisition - Pro Forma Information (Details) - Merger of Liberty Bank, N.A. into The Middlefield Banking Company [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Net interest income | $ 10,354 |  |
Noninterest income | 744 |  |
Net income | $ 2,625 |  |
Net interest income |  | $ 37,646 | $ 34,817
Noninterest income |  | 4,920 | 5,485
Net income |  | $ 8,438 | $ 8,692
Basic pro forma (in dollars per share) |  | $ 2.79 | $ 4.12
Diluted pro forma (in dollars per share) |  | $ 2.77 | $ 4.10

X
- Definition The pro forma net interest Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References No definition available. + Details
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Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The pro forma net noninterest Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References No definition available. + Details
Name: | mbcn_BusinessAcquisitionProFormaNoninterestNetIncomeLoss
Namespace Prefix: | mbcn_
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Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of net interest income of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References No definition available. + Details
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- Definition This element represents the amount of the net noninterest income of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References No definition available. + Details
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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Details
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