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Note 7 - Loans and Related Allowance for Loan and Lease Losses - Impaired Loans by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Commercial And Industrial [Member]
Recorded investment, with no related allowance	$ 569	$ 1,027
Unpaid principal balance, with no related allowance	569	1,025
Recorded investment, with related allowance	275	781
Unpaid principal balance, with related allowance	275	781
Related allowance	184	388
Recorded investment	844	1,808
Unpaid principal balance	844	1,806
Real Estate Construction Porfolio Segment [Member] | Residential Loan [Member]
Recorded investment, with related allowance	464
Unpaid principal balance, with related allowance	462
Related allowance	104
Real Estate Construction Porfolio Segment [Member]
Recorded investment, with no related allowance	1,076	1,657
Unpaid principal balance, with no related allowance	1,076	1,651
Recorded investment, with related allowance	17	130
Unpaid principal balance, with related allowance	17	130
Related allowance	17	130
Recorded investment	1,093	1,787
Unpaid principal balance	1,093	1,781
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]
Recorded investment, with no related allowance	2,774	2,445
Unpaid principal balance, with no related allowance	2,771	2,443
Recorded investment, with related allowance		1,436
Unpaid principal balance, with related allowance		1,436
Related allowance	104	276
Recorded investment	3,238	3,881
Unpaid principal balance	3,233	3,879
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]
Recorded investment, with no related allowance	1,378	2,337
Unpaid principal balance, with no related allowance	1,375	2,335
Recorded investment, with related allowance		3,862
Unpaid principal balance, with related allowance		3,846
Related allowance	239	39
Recorded investment	6,466	6,199
Unpaid principal balance	6,453	6,181
Consumer Portfolio Segment [Member]
Recorded investment, with no related allowance	5	6
Unpaid principal balance, with no related allowance	5	6
Recorded investment, with related allowance
Unpaid principal balance, with related allowance
Related allowance
Recorded investment	5	6
Unpaid principal balance	5	6
Commercial Loans [Member]
Recorded investment, with related allowance	5,088
Unpaid principal balance, with related allowance	5,078
Related allowance	239
Recorded investment, with no related allowance	5,797	7,466
Unpaid principal balance, with no related allowance	5,791	7,454
Recorded investment, with related allowance	5,849	6,215
Unpaid principal balance, with related allowance	5,837	6,199
Related allowance	544	833
Recorded investment	11,646	13,681
Unpaid principal balance	$ 11,628	$ 13,653

X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

+ Details

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

X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

+ Details

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

X

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

+ Details

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

X

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

+ Details

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

X

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

+ Details

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

X

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953550-111524

+ Details

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

X

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

+ Details

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Namespace Prefix:
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X

- Details

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- Details

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Namespace Prefix:
Data Type:	na
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X

- Details

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Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mbcn_CommercialLoansMember
Namespace Prefix:
Data Type:	na
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- Details

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Data Type:	na
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