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Note 7 - Loans and Related Allowance for Credit Losses - Primary Segments of the Loan Portfolio (Details) - USD ($)
$ in Thousands

Sep. 30, 2025

Jun. 30, 2025

Dec. 31, 2024

Sep. 30, 2024

Jun. 30, 2024

Dec. 31, 2023

Loans

^[2],[3]

$ 1,607,024

^[1],[4]

$ 1,519,614

Less: Allowance for credit losses

(23,029)

^{[1],[2],[3],[4]}

$ (22,335)

(22,447)

^[2],[3]

$ (22,526)

$ (21,795)

$ (21,693)

Net loans

^[2],[3]

1,583,995

^[1],[4]

1,497,167

Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]

Loans

^[2],[3]

221,600

^[1],[4]

181,447

Less: Allowance for credit losses

(2,941)

(2,538)

(2,100)

(2,190)

(2,058)

(2,668)

Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]

Loans

^[2],[3]

390,354

^[1],[4]

412,291

Less: Allowance for credit losses

(4,919)

(4,628)

(8,364)

(8,356)

(7,981)

(4,480)

Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]

Loans

^[2],[3]

88,899

^[1],[4]

89,849

Less: Allowance for credit losses

(1,164)

(1,057)

(1,310)

(1,393)

(1,268)

(1,796)

Residential Portfolio Segment [Member]

Loans

^[2],[3]

366,307

^[1],[4]

353,442

Less: Allowance for credit losses

(5,989)

(5,801)

(5,236)

(5,110)

(4,891)

(5,450)

Commercial And Industrial [Member]

Loans

^[2],[3]

269,422

^[1],[4]

229,034

Less: Allowance for credit losses

(3,426)

(3,014)

(2,427)

(2,412)

(2,430)

(4,377)

Home Equity Lines of Credit [Member]

Loans

^[2],[3]

159,805

^[1],[4]

143,379

Less: Allowance for credit losses

(1,007)

(988)

(897)

(869)

(813)

(750)

Construction and Other [Member]

Loans

^[2],[3]

104,843

^[1],[4]

103,608

Less: Allowance for credit losses

(3,513)

(4,234)

(2,052)

(2,131)

(2,290)

(1,990)

Consumer Portfolio Segment [Member]

Loans

^[2],[3]

5,794

^[1],[4]

6,564

Less: Allowance for credit losses

$ (70)

$ (75)

$ (61)

$ (65)

$ (64)

$ (182)

[1]	Accrued interest of $5.5 million and $5.5 million at June 30, 2025 and December 31, 2024, respectively, is excluded from amortized cost and presented in "accrued interest receivable and other assets" on the Consolidated Balance Sheets.
[2]	Accrued interest of $5.9 million and $5.5 million at September 30, 2025 and December 31, 2024, respectively, is excluded from amortized cost and presented in "accrued interest receivable and other assets" on the Consolidated Balance Sheets.
[3]	Unearned income, including net deferred loan fees and costs and unamortized premiums and discounts, totaled $6.6 million and $8.2 million at September 30, 2025 and December 31, 2024, respectively.
[4]	Unearned income, including net deferred loan fees and costs and unamortized premiums and discounts, totaled $7.1 million and $8.2 million at June 30, 2025 and December 31, 2024, respectively.

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

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

X

- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_OwnerOccupiedLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_NonownerOccupiedLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_MultifamilyLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_HomeEquityLinesOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=mbcn_ConstructionAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type: