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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: