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Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Threshold for Loans Evaluated for Impairment [Member] | Outside Consultant [Member]
Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) [Line Items]
Loans and Leases Receivable, Gross, Commercial	250,000us-gaap_LoansAndLeasesReceivableCommercial / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = mbcn_OutsideConsultantMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbcn_ThresholdForLoansEvaluatedForImpairmentMember
Threshold for Loans Evaluated for Impairment [Member] | Criticized Relationships [Member]
Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) [Line Items]
Financing Receivable, Gross	125,000us-gaap_NotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = mbcn_CriticizedRelationshipsMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbcn_ThresholdForLoansEvaluatedForImpairmentMember
Threshold for Loans Evaluated for Impairment [Member]
Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) [Line Items]
Loans and Leases Receivable, Gross, Commercial	1,000,000us-gaap_LoansAndLeasesReceivableCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = mbcn_ThresholdForLoansEvaluatedForImpairmentMember

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524

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- Definition

Amount before allowance of commercial loans and leases receivable includes, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a, b

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a),(b))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(3))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 3

-Article 9

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