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Note 10 - Risks and Uncertainties - Loans at Risk (Details) - Commercial Portfolio Segment [Member] - COVID-19 [Member] $ in Thousands	Sep. 30, 2020 USD ($)
Number of loans at risk	30
Balance of loans at risk	$ 60,516
% of total loans at risk	5.40%
Retail Loan [Member]
Number of loans at risk	10
Balance of loans at risk	$ 18,638
% of total loans at risk	1.70%
Multifamily Loan [Member]
Number of loans at risk	0
Balance of loans at risk	$ 0
% of total loans at risk	0.00%
Ambulatory Care, Nursing/Rehabilitation and Social Assistance [Member]
Number of loans at risk	1
Balance of loans at risk	$ 9,672
% of total loans at risk	0.90%
Hospitality and Tourism Loan [Member]
Number of loans at risk	15
Balance of loans at risk	$ 31,707
% of total loans at risk	2.80%
Restaurant/food service/bar Loan [Member]
Number of loans at risk	0
Balance of loans at risk	$ 0
% of total loans at risk	0.00%
Other Loans [Member]
Number of loans at risk	4
Balance of loans at risk	$ 499
% of total loans at risk	0.00%

X

- Definition

The potential impact of the occurrence of the defined risk or adverse resolution of an uncertainty on the entity's amount of loans, including a range of potential loss if reasonably estimable.

+ References

No definition available.

+ Details

Name:	mbcn_UnusualRiskOrUncertaintyImpactAmountOfLoans
Namespace Prefix:	mbcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The potential impact of the occurrence of the defined risk or adverse resolution of an uncertainty on the entity's number of loans, including a range of potential loss if reasonably estimable.

+ References

No definition available.

+ Details

Name:	mbcn_UnusualRiskOrUncertaintyImpactNumberOfLoans
Namespace Prefix:	mbcn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The potential impact of the occurrence of the defined risk or adverse resolution of an uncertainty on the entity's percentage of total loans, including a range of potential loss if reasonably estimable.

+ References

No definition available.

+ Details

Name:	mbcn_UnusualRiskOrUncertaintyImpactPercentOfTotalLoans
Namespace Prefix:	mbcn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_MultifamilyLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_RestaurantFoodServiceBarLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_OtherLoansMember
Namespace Prefix:
Data Type:	na
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Period Type: