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Note 18 - Fair Value Measurements (Details Textual) | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Equity Securities without Readily Determinable Fair Value, Number of Securities | 1 |
Equity Securities without Readily Determinable Fair Value, Amount |  | $ 250,000
Estimated Selling Costs of Impaired Loans | $ 492,000 | $ 1,300,000

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- Definition Number of investment securities without readily determinable fair value. + References No definition available. + Details
Name: | mbcn_EquitySecuritiesWithoutReadilyDeterminableFairValueNumberOfSecurities
Namespace Prefix: | mbcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The estimated amount of selling costs that would incur when impaired loans sold. + References No definition available. + Details
Name: | mbcn_EstimatedSellingCostsOfImpairedLoans
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117539-209714 + Details
Name: | us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant