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Note 5 - Fair Value Measurements - Assets Measured on a Nonrecurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Premises and equipment held for sale | $ 1,015 |
Collateral-dependent loans |  | $ 3,321,000
Fair Value, Inputs, Level 1 [Member] |  |
Premises and equipment held for sale | 0 |
Collateral-dependent loans |  | 0
Fair Value, Inputs, Level 2 [Member] |  |
Premises and equipment held for sale | 0 |
Collateral-dependent loans |  | 0
Fair Value, Inputs, Level 3 [Member] |  |
Premises and equipment held for sale | $ 1,015 |
Collateral-dependent loans |  | $ 3,321,000

X
- Definition Fair value of impaired loans receivable. + References No definition available. + Details
Name: | mbcn_ImpairedLoansReceivableFairValueDisclosure
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The fair value of the property plant and equipment held for sale. + References No definition available. + Details
Name: | mbcn_PropertyPlantAndEquipmentHeldForSaleFairValue
Namespace Prefix: | mbcn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |