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v3.25.3

Note 11 - Subsequent Event (Details Textual) - Subsequent Event [Member] | Nov. 01, 2025 $ / shares | Oct. 22, 2025 $ / shares
--- | --- | ---
Farmers [Member] |  |
Share Price (in dollars per share) | $ 13.37 | $ 13.28
Farmers [Member] |  |
Business Combination, Equity Exchange Ratio |  | 2.6

X
- Definition Equity exchange ratio under business combination. + References No definition available. + Details
Name: | mbcn_BusinessCombinationEquityExchangeRatio
Namespace Prefix: | mbcn_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
Name: | us-gaap_SharePrice
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
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: | dei_LegalEntityAxis=mbcn_FarmersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=mbcn_FarmersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |