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Note 9 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Deposits, Total	$ 1,167,172	$ 1,166,610
Cannabis Customers [Member]
Deposits, Total	$ 9,400	$ 12,700
Deposits, Percent of Total	0.80%	1.10%

X

- Definition

The percent of total deposits of certain deposit customers/categories.

+ References

No definition available.

+ Details

Name:	mbcn_DepositsPercentOfTotal
Namespace Prefix:	mbcn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

+ Details

Name:	us-gaap_Deposits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_CounterpartyNameAxis=mbcn_CannabisCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: