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Note 18 - Fair Value Disclosure Measurements (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2006 | Dec. 31, 2022 | Dec. 31, 2021
Estimated Selling Costs of Impaired Loans |  | $ 688,000 | $ 901,000
Mandatorily Redeemable Securities |  | $ 8,200,000 | $ 8,000,000.0
London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.67% |  |
Notes Payable, Other Payables [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.67% |

X
- Definition The estimated amount of selling costs that would incur when impaired loans sold. + References No definition available. + Details
Name: | mbcn_EstimatedSellingCostsOfImpairedLoans
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of mandatorily redeemable securities. + References No definition available. + Details
Name: | mbcn_MandatorilyRedeemableSecurities
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableOtherPayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |