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Note 4 - Loans and Related Allowance for Loan Losses (Details) - Troubled Debt Restructurings Subsequently Defaulted (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2013
Residential Real Estate Mortgage [Member] |  |  |
Real estate- mortgage: |  |  |
Number of contracts | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember | 2 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember |
Recorded investment | $ 15 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember | $ 89 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ResidentialRealEstateMortgageMember |
Commercial and Industrial [Member] |  |  |
Real estate- mortgage: |  |  |
Number of contracts |  | 6 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember | 5 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember
Recorded investment |  | 256 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember | 574 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialAndIndustrialMember
Commercial Real Estate Mortgage [Member] |  |  |
Real estate- mortgage: |  |  |
Number of contracts |  |  | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember
Recorded investment |  |  | 190 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_CommercialRealEstateMortgageMember
Real Estate Construction [Member] |  |  |
Real estate- mortgage: |  |  |
Number of contracts |  | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember |
Recorded investment |  | 3,622 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_RealEstateConstructionMember |
Consumer Installment [Member] |  |  |
Real estate- mortgage: |  |  |
Number of contracts |  | 1 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember |
Recorded investment |  | $ 5 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = mbcn_ConsumerInstallmentMember |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524 + Details
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