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Note 9 - Lease Commitments (Details Textual)	9 Months Ended
	Sep. 30, 2019 USD ($)	Nov. 01, 2019 USD ($)
Number of Branch Locations by Utilized Leases	6
Lease, Right-of-Use Asset, Net	$ 4,500,000
Operating Lease, Liability, Total	943,000
Finance Lease, Liability, Total	3,538,000
Subsequent Event [Member] | Plain City, Ohio [Member]
Finance Lease, Right-of-Use Asset		$ 571,000
Finance Lease, Liability, Total		$ 571,000
Premises and Equipment, Net [Member]
Finance Lease, Right-of-Use Asset	3,500,000
Accrued Interest Receivable and Other Assets [Member]
Operating Lease, Right-of-Use Asset	943,000
Other Borrowings [Member]
Finance Lease, Right-of-Use Asset	3,600,000
Interest Payable and Other Liabilities [Member]
Operating Lease, Liability, Total	$ 945,000
Minimum [Member]
Lessee, Operating Lease, Remaining Term	1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Term	6 years

X

- Definition

Amount of lessee's right to use underlying asset under operating and finance lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	mbcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Remaining term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

Represents number of branch locations by utilized locations.

+ References

No definition available.

+ Details

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Namespace Prefix:	mbcn_
Data Type:	xbrli:integerItemType
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X

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Balance Type:	credit
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X

- Definition

Amount of lessee's right to use underlying asset under finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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