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Note 5 - Fair Value Measurements (Details Textual) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Estimated Selling Costs of Impaired Loans	$ 2,000,000	$ 492,000

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- Definition

The estimated amount of selling costs that would incur when impaired loans sold.

+ References

No definition available.

+ Details

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