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Note 17 - Fair Value Disclosure Measurements (Details) - Assets Measured on a Recurring Basis (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | $ 154,334 us-gaap_AvailableForSaleSecuritiesCurrent | $ 157,143 us-gaap_AvailableForSaleSecuritiesCurrent
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 22,896 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 25,763 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
US Government Agencies Debt Securities [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 22,896 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 25,763 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 98,345 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 88,614 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
US States and Political Subdivisions Debt Securities [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 98,345 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 88,614 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 29,391 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 38,323 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 29,391 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 38,323 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Mortgage-backed Securities, Issued by Private Enterprises [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 2,919 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 3,693 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Mortgage-backed Securities, Issued by Private Enterprises [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 2,919 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember | 3,693 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 153,551 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 156,393 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Debt Securities [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 153,551 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 156,393 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Equity Securities in Financial Institutions [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 33 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = mbcn_EquitySecuritiesInFinancialInstitutionsMember | 5 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = mbcn_EquitySecuritiesInFinancialInstitutionsMember
Equity Securities in Financial Institutions [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 750 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = mbcn_EquitySecuritiesInFinancialInstitutionsMember | 745 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = mbcn_EquitySecuritiesInFinancialInstitutionsMember
Equity Securities in Financial Institutions [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 783 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = mbcn_EquitySecuritiesInFinancialInstitutionsMember | 750 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = mbcn_EquitySecuritiesInFinancialInstitutionsMember
Fair Value, Inputs, Level 1 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | 33 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 5 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member] |  |
Assets measured on a recurring basis: |  |
Assets Measured on a Recurring Basis | $ 154,301 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | $ 157,138 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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