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Note 10 - Risks and Uncertainties (Details Textual) - Subsequent Event [Member] $ in Millions | May 03, 2020 USD ($) | May 01, 2020 USD ($) | Apr. 21, 2020 USD ($)
--- | --- | --- | ---
Payroll Protection Plan, Number of Loan Applications Approved | 1,048 |  |
Payment Protection Plan, Amount to be Funded | $ 138.1 |  |
Financing Receivable, Number of Payment Deferrals |  | 606 |
Financing Receivable, Deferred Payments |  | $ 333.2 |
Financing Receivable, Number of Principal and Interest Payments and Extension of Maturity Date Payment Deferrals |  |  | 252
Financing Receivable, Principal and Interest Payments and Extension of Maturity Date Payment Deferrals |  |  | $ 147.0
Residential Mortgage and Consumer [Member] |  |  |
Financing Receivable, Number of Payment Deferrals |  | 59 |
Financing Receivable, Deferred Payments |  | $ 7.8 |

X
- Definition The amount of payment deferral requests received on financing receivable. + References No definition available. + Details
Name: | mbcn_FinancingReceivableAmountOfPaymentDeferralRequestsReceived
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of payment deferral requests received on financing receivable. + References No definition available. + Details
Name: | mbcn_FinancingReceivableNumberOfPaymentDeferralRequestsReceived
Namespace Prefix: | mbcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of principal and interest payments and extension of maturity date payment deferrals on financing receivable. + References No definition available. + Details
Name: | mbcn_FinancingReceivableNumberOfPrincipalAndInterestAndExtensionOfMaturityDatePaymentDeferrals
Namespace Prefix: | mbcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of principal and interest payment and extension of maturity date payment deferrals on financing receivable. + References No definition available. + Details
Name: | mbcn_FinancingReceivablePrincipalAndInterestPaymentsAndExtensionOfMaturityDatePaymentDeferrals
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of loans to be funded under the Payment Protection Plan. + References No definition available. + Details
Name: | mbcn_PaymentProtectionPlanAmountToBeFunded
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The number of loan applications approved under the Payroll Protection Plan. + References No definition available. + Details
Name: | mbcn_PayrollProtectionPlanNumberOfLoanApplicationsApproved
Namespace Prefix: | mbcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_ResidentialMortgageAndConsumerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |