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Note 4 - Loans and Related Allowance for Loan Losses (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Note 4 - Loans and Related Allowance for Loan Losses (Details) [Line Items]        
Number of Days Past Due 90 days      
Financing Receivable, Modifications, Recorded Investment $ 2,900,000us-gaap_FinancingReceivableModificationsRecordedInvestment $ 5,500,000us-gaap_FinancingReceivableModificationsRecordedInvestment    
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 207,000us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans 439,000us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans 756,000us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans  
Loans and Leases Receivable, Net Amount 463,738,000us-gaap_LoansAndLeasesReceivableNetReportedAmount 428,679,000us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Loans and Leases Receivable, Allowance 6,846,000us-gaap_LoansAndLeasesReceivableAllowance 7,046,000us-gaap_LoansAndLeasesReceivableAllowance 7,779,000us-gaap_LoansAndLeasesReceivableAllowance 6,819,000us-gaap_LoansAndLeasesReceivableAllowance
Real Estate Construction [Member]        
Note 4 - Loans and Related Allowance for Loan Losses (Details) [Line Items]        
Loans and Leases Receivable, Net Amount 900,000us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
600,000us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
   
Loans and Leases Receivable, Allowance 868,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
576,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
1,123,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
438,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_RealEstateConstructionMember
Commercial Real Estate Mortgage [Member]        
Note 4 - Loans and Related Allowance for Loan Losses (Details) [Line Items]        
Loans and Leases Receivable, Allowance 1,576,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
2,170,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
1,991,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
1,306,000us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
Loans Receivable, Paid Off During Period, Allowance Recorded 500,000mbcn_LoansReceivablePaidOffDuringPeriodAllowanceRecorded
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= mbcn_CommercialRealEstateMortgageMember
     
Threshold for Loans Evaluated for Impairment [Member] | Outside Consultant [Member]        
Note 4 - Loans and Related Allowance for Loan Losses (Details) [Line Items]        
Loans and Leases Receivable, Gross, Commercial 250,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mbcn_OutsideConsultantMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mbcn_ThresholdForLoansEvaluatedForImpairmentMember
     
Threshold for Loans Evaluated for Impairment [Member] | Criticized Relationships [Member]        
Note 4 - Loans and Related Allowance for Loan Losses (Details) [Line Items]        
Financing Receivable, Gross 125,000us-gaap_NotesReceivableGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= mbcn_CriticizedRelationshipsMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mbcn_ThresholdForLoansEvaluatedForImpairmentMember
     
Threshold for Loans Evaluated for Impairment [Member]        
Note 4 - Loans and Related Allowance for Loan Losses (Details) [Line Items]        
Notes, Loans and Financing Receivable, Gross, Current 150,000us-gaap_NotesAndLoansReceivableGrossCurrent
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mbcn_ThresholdForLoansEvaluatedForImpairmentMember
     
Loans and Leases Receivable, Gross, Commercial $ 1,000,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mbcn_ThresholdForLoansEvaluatedForImpairmentMember